On close votes, he’s been voting against Boehner on conservative principles when Boehner needs a vote to close a deal with the liberal Democrats. Really, conservatives are considered more of an enemy to the Boehners of the world than are liberals.
McCain is another case study: He fights, and spends more political ad money against conservative challengers to his power than he does against the Dems.
The 2008 bailout fight was a good example of good republicans voting against both parties. My congressman voted against it and was stripped of money in the final weeks of the campaign and lost by 2%. The democrat that replaced him voted for Obamacare.
In 2010 we sent my congressman back to Washington and reelected him by a wide margin in 2012.