One of the new features on our Congress Votes database is a score for each lawmaker that tracks the percentage of votes which they agree with a majority of their party colleagues (here are the current House members, for example).
Among the top House leaders, Speaker Nancy Pelosi, D-Calif., has a perfect record of voting with a majority of Democrats, but that could be because, by tradition, the Speaker rarely votes and Pelosi has voted 73 times out of 425 recorded tallies this year. House Majority Leader Steny Hoyer, D-Md., has a 97.8 percent score. The list of votes in which he has gone against most other Democrats includes the recent vote on an Iraq and Afghanistan war funding bill.
House Minority Leader John Boehner, R-Ohio, has voted with his Republican colleagues 95.3% of the time. Among his votes in opposition were a measure to extend whistleblower protections and legislation that would name a post office after the late author Rachel Carson. In both cases Boehner voted "No" while most Republicans approved.