Unfortunately, impeachment is a political process, not a legal one. Impeaching Bush would be the worst thing the Democrats could possibly do, unless (a) it's a double bill, also impeaching Cheney at the same time, and (b) there is significant Republican commitment, enough to *guarantee* that the Senate convicts even when the Republican lie machine gets turned up to 11 about President Pelosi. Get twenty Republican Senators to swear on their Bibles and their faith in God, on a live primetime broadcast on Faux, that they will vote to remove both Bush and Cheney no matter what comes up, and then it's time for impeachment. If you don't have that kind of Republican commitment, Bush will stay in, he hasn't got any credibility or legitimacy left to lose, so he won't be weakened, and the rest of the Republican party will be even more pissed off and unwilling to compromise or even listen to the people than they already are.