I'm surprised to see Josh giving credence to the birther/truther false equivalence.  Truthers, however misinformed or misguided, are not marching in the streets demanding a special prosecutor for Bush and Cheney.  Truthers are not advocating taking up arms against the government, or a vigilante court for Condoleeza Rice.  Believing 9/11 was intentionally allowed to happen by GWB is no crazier than believing the moon landing was filmed in Burbank, or that alien spacecraft landed in Roswell, or that Elvis is alive.  It's a little crazy, but it's 99% harmless, garden-variety, American crazy, with no socio-political ramifications. 

Birthers are declaring the President an illegal imposter and asking the rest of us, variously, to disown him, impeach him, investigate him, and ignore federal laws and agents.

Truthers, if they advocate for anything, want more information about the September 11th attacks.  Birthers want to subvert democracy.  There's no comparison.