James L. at the Swing State Project takes a look at the "top 75 non-open seat House races this cycle in terms of each challenger's cash-on-hand competitiveness", which is defined as the ratio of the challenger's cash-on-hand to that of the incumbent. The idea is that having $500K against an incumbent with $2 million isn't as impressive as having $150K against an incumbent with $200K. Two Texan Democrats - Michael Skelly, at #2 with more than twice as much cash as Rep. John Culberson, and Larry Joe Doherty at #42 - make the list, while no Republican challengers do. Check it out.