The third reason is amusing:
"3. The looniness.
Between the Tea Party and the electoral sweeps, the right seemed to decide that it was popular enough that it could let it all hang out without getting any blowback. The American right has always been loony and paranoid, but 2011 was when the looniness really came out and became unavoidable. There were Glenn Beck’s paranoid rantings. So many right wingers became loudly fixated on President Obama’s birth story that he was eventually forced to release his birth certificate. Republican presidential candidates find they must pay tribute to all sorts of irrational nonsense, from denying global warming to creationism, in order just to get their foot in the door. Average Americans have come to expect that we’ll be hearing about communist mind control chemicals in the drinking water soon. It’s hard to see the Tea Party as rational actors who can make solid economic decisions when they spend so much time emailing each other with lists of reasons they think President Obama was born in Kenya."
http://www.alternet.org/teaparty/152935/4_reasons_the_right-wing_propaganda_machine_has_failed_to_destroy_ows/The rest of it at the link.