Riiiiiight. It's common knowledge that voters despise Congress as a whole, but think their own personal representative is a god. And if such an attack were to occur, Bush's fate would be entirely determined by how he responded. If he sat on his hands and did nothing, sure, he might be removed. If he immediately declares WWIII, he'll be a lock for reelection.
By the way, if the whole of Congress is going to be thrown out, then who's going to be around to impeach Bush? If the public turns on them, they'll cease to give a damn. And what the hell does "failure to perform his duties" mean? The Constitution clearly states that the president can only be "removed from office on impeachment for, and conviction of, treason, bribery, or other high crimes and misdemeanors." Pissing off the public is not a "high crime or misdemeanor."
You know they would die to impeach him as payback for Clinton. They woould say we need a "real leader" like Dick Cheney in charge. Then they would try to impeach Cheney over Haliburton.
As always, the Dems see sickness, poverty, misfortune, economic failure, etc as huge political opportunities. And they're chomping at the bit.