From David Kuhn at Real Clear Politics:
Fully 35 percent of Democrats believe George W. Bush had advance knowledge of the 9/11 terrorist attacks. Fully 28 percent of Republicans believe Barack Obama wasn't born in the United States.
Meet the fanatical third.....
A few years ago, an Emory psychologist scanned the brains of self-described partisans. Partisans were able to notice the hypocritical statements of the opposing candidate but not the inconsistencies of their preferred candidate.