There were 34 Democratic members of the House of Representatives who voted against comprehensive health care reform last March. Politico has a story on it, but here are the details (from my own analysis):
Number who stood for reelection to the House: 30/34
Of those 30, number who won: 13 (38%)
Of the 2 who ran for higher office, number who won: 0
Of the 2 who retired, number whose seats the Democrats retained: 0
Great night for those who opposed health care reform!
I fully expect Nate Silver's blog to come out with a comprehensive analysis, looking at those Democrats who voted for it from Republican majority districts and how way they did. But, suffice to say, voting against health care reform to appease one's conservative constituents did not appear to buy sufficient good will.