David Frum had a really fascinating piece on his site last week about the longtime feud, essentially, between the part of the conservative movement that wants Muslims to vote Republican (led by Grover Norquist) and the side that thinks every last one of them is a terrorist or tied to terrorists (led by Frank Gaffney.)
A nugget I never knew about: a couple of people later convicted of terrorism were contributors to Bush's 2000 campaign, and even visited the White House. If the same thing had happened with Obama, I've got a feeling we would've heard about it, right?