And they came out already, starting with Hannity, who is claiming that President Obama knew about Maj. Hasan.
As Cesca reminds us:
After 9/11, everyone -- everyone -- supported President Bush. But it's clear that the wingnuts and Republicans will never give our current president the same deference.

But what about George Bush – did he know? Maybe we can start a new form of “Ft. Hood truthers” here, ones that have a little more evidence on their side:
The FBI and the Army last year investigated contacts between a Yemen-based militant Islamist prayer leader and the Army psychiatrist accused of last week’s deadly shooting rampage at Fort Hood, Texas, but they dropped the case after concluding that he didn’t pose a terrorist threat, a senior federal law enforcement official said Monday.
The disclosure on Monday that Army Maj. Nidal Malik Hasan communicated with an imam who had ties to Sept. 11, 2001, hijackers was sure to raise the question of whether U.S. intelligence and law enforcement agencies had information that, if properly shared and investigated, might have helped to prevent the attack.

So not only was this guy making contacts under Bush’s watch, but Bush’s FBI investigated him.
I would say there is more just in saying that Bush knew of Hassan than Obama. I mean this guy was brought up in the military under Bush’s watch and slipped through under Bush’s “totally awesome” interrogation and investigating techniques. I wonder what Dick Cheney will have to say about this?