Good links on Republican Radicalization

Some of my web-surfing this morning is relevant to my last post about the radicalization of the Republican party.  Rather than rehash yesterday's post, here are some links that bolster the point:

Here's one from David Frum about how the Republican party has changed since 2000, written by a conservative former speechwriter for George W. Bush.

Here are a couple of posts from Jon Chait making the point that Republicans aren't really interested in deficit reduction, only tax cuts, and defending President Obama's leadership around budget issues (basically making the point that he has tried being very involved, tried staying out entirely, and tried negotiating behind the scenes all at different times, and found that none of those approaches work.  In order to lead, the other party has to be willing to follow).