Off the Kuff Rotating Header Image

Another analysis of the Democratic judicial primaries

Recently, I received an email from Brandon Rottinghaus, who is a political science professor at UH. He and a graduate student of his had put together a mathematical model of the 2010 Democratic primary for the countywide judicial races. I thought it was interesting and worth sharing, so I present to you here what he sent me:

One of my graduate students (Chris Nicholson) and I were interested in the outcome of the 2010 primaries, in particular with respect to judicial races. To appease our curiosity, we collected data pertaining to the Democratic Primary election in Harris County for all judicial county-wide seats. We only focused on county specific races, but we also included candidates for those District Courts which had substantial portions of their district in Harris County. We collected all the relevant candidate-specific data we could think of, including race, gender, endorsements by influential groups (HBAD, the AFL-CIO, GLBT, Harris County Coalition of Elected Officials), ballot order and campaign funds raised and spent. Although we have some missing data (especially on the campaign funds variables) we have most all of the data for each candidate and each race. This yielded 72 total races.

Model 1: Total Votes Received

We ran two statistical models. In the first, we explain the factors that predict the total number of votes received by each candidate. (If anyone is interested, this is an ordinary least squares regression model with a continuous dependent variable; goodness of fit diagnostics are available upon request). Specifically, we control for gender, having a Hispanic surname, endorsements by the AFL-CIO, GLBT, the Harris County Elected Officials, being first on the ballot and the amount of money raised on the January 15, 2010 report and the 30-Day report. Although each variable (referenced above) has some effect on the number of votes received by each candidate, we are interested in those relationships that reach statistical significance ― that is, the relationship occurs not by chance.

Results: Total Votes Received

The results from this first model indicate that the following factors were influential in predicting primary vote totals (number of additional votes for each effect in parentheses): being first on the ballot (+8,680 votes), being endorsed by the Harris County Coalition of Elected Officials (+8,302 votes), being endorsed by the Houston Black American Democrats (+7,089 votes), being a female (+5,725 votes) and more money raised (and reported) in the January 15 filing (+.25 votes for every 1% increase in funds raised). All of these effects are strong, except the latter, which is statically significant but substantively very small.

Model 2: Probability of Winning

In the second model, we truncate the outcome to explaining the probability of those who won (including those who gained enough votes to enter a runoff election) . (If anyone is interested, this is logit model with a dichotomous dependent variable; goodness of fit diagnostics are available upon request and we used marginal effects to calculate the effect of each independent variable on the dependent variable). The variables we included were the same as in Model 1. Again we are looking for statistically significant relationships.

Results: Probability of Winning

The results from this model show that gender and being endorsed by the Houston Black American Democrats were the key factors predicting victory. Specifically, women were 35% more likely to win than men and HBAD endorsees were 50% more likely to win than those not endorsed by HBAD. None of the other variables reached standard levels of statistical significance.

Summary: The 2010 Democratic Primary in a Nutshell

Of course, these results are broad trends, not specific to every judicial race in the County, but the results give us some sense of the most influential factors from the 2010 Democratic primary.

In summing up the results, endorsements were important, but some endorsements mattered than others, and campaign funds raised mattered very little. The Houston Black American Democrats endorsement seemed to be the most influential in terms of prospects for victory. Their organizational push to get the vote out seems to have paid off. In addition, being a female candidate was a good predictor of victory, suggesting that Democratic primary voters were more interested in electing women to the bench than men. This could be the result of a concerted effort by organizations devoted to making the judiciary more diverse, or this could be a demographic effect where more women voting in the primary translated into more votes for female candidates.

Brandon Rottinghaus
University of Houston

The accompanying spreadsheet for their analysis is here. Let me know what you think. They’re working on a similar model for the Republican results, and when they have it I will share that as well. My thanks to Dr. Rottinghaus for sending this to me.

Related Posts:

3 Comments

  1. Mainstream says:

    I am not a whiz at all the analysis, but I would expect that the high profile CD 18 and Miles-Edwards contests brought out higher black turnout in a Democrat primary than typical. I suspect that the race and gender of the VOTERS may be a better indicator of the results. I doubt that the Black Democrat endorsement influenced the result, so much as it reflects the preferences, even consensus, of the large pool of black voters participating in the Democrat primary this cycle. What portion of the total Democrat primary participants were black, Hispanic, Anglo, Asian? Were there race-related differences in turnout?

  2. This is a politically correct analysis that does not deal explicitly and directly with age, class, or race. So, it attributes a complex age-class-race vote pattern with the HBAD endorsement. This is simply the co-variance fallacy.

    The tell-tale outlier is nomination of LaRouche spokesmodel, Kesah Rogers.

    Here’s the deal: The 2008 campaign energized and uncovered a lot of new voters, including white, black, brown, and yellow (admittedly, not the best terminology) voters — all very heavily represented, especially among young voters.

    The DNC calls these “surge voters”. The pollsters relied on most by the HCDP — Greenberg, Quinlan, Rosner — call them “new base voters”. This re-ignites a long-running argument among consultants between those as would “mobilize” or “persuade”.

    We are probably not doing either.

    The new base voters do not need to be persuaded not to vote for the increasingly extreme and now often noxious GOP. But, they do have to be persuaded to vote at all, especially for empty suits — judicial candidates — running on empty rhetoric — values.

    And, the means of persuading these new base voters are, Duh!, the same as the means of mobilizing them:

    (1) Micro-targeting, …
    (2) Social networking, and …
    (3) A simple platform, and sequential message, involving no more than three issues: energy + economy + environment.

    These require …

    (1) A robust data-mining tool — the Catalist, used by the Obama campaign in other states …
    (2) An extensible constituent management platform — Drupal/CiviCRM — used by formerly the Obama campaign, now recovery.gov and whitehouse.gov.
    (3) A deliberative process, not an Austin hack hired by two large donors to provide cover for bi-partisan concession-tenders in the Texas Legislature.

    Demographic trends are not going to passively sweep the county and the state for Democrats.

    It will take a real party that can cultivate self-identified Democrats and Independents as well as dispense with the campaign consultants who use the internet as a cheap substitute for postage and html as a cheaper substitute for four-color union printers.

  3. […] Last month, I printed an analysis of the Democratic judicial primaries by University of Houston political science professor Brandon Rottinghaus, who along with grad student Chris Nicholson built a mathematical model to predict the number of votes a candidate would receive based of a variety of factors such as money raised, ballot position, and specific endorsements. At the time, I said Dr. Rottinghaus was working on a similar analysis for the Republican primaries and that I’d share it here when he completed it. I now have his analysis, which is as follows: Our friend Charles Kuffner was kind enough to post our earlier analysis of the Democratic Primary. To follow up, we gathered data on the Republican Primary election in Harris County for all county-wide elected offices. As with the Democrats, we collected all the relevant available candidate-specific data we could think of, including: […]