Or the same Barack Obama the voted against raising the debt ceiling as a Senator when there was a Republican president but now considers not voting to raise the debt ceiling the height of irresponsibility.
The examples never end with either party and the only way to make sense of the behavior is to look at it through the lens of them doing what they think they have to do to get their party back in power. In the case of the debt ceiling issue the fact that the government has to raise it to pay of it's debts doesn't sit well with the public so the out party tries to hang it us much as they can around the neck of the other party, hence Obama's 'evolving' views on the issue.