I read the current Vice-President (Cheney) becomes President regardless.
If the Senate is tied, the Vice-President (again Cheney) casts the tie breaker.
Actually, no he doesn't. The 12th Amendment has specific requirements for both the Quorom and the margin of victory that are tougher than a normal Senate vote. The 12th calls for a majority of the whole number of Senators for that vote and the VP isn't a Senator. Under current law, the Speaker (presumably Hastert) would be next in line, but he would have to give up his seat to serve as Acting President, so he probably wouldn't do it. next would be the President-pro-tem (probably Stevens) who would have the same conundrum and then and only then would the cabinet secretaries start to enter the pictire starting with Powell at the State Department.
However, if the election goes to Congress, I don't see any chance that the GOP won't have enough delegations to elect Bush. The Senate is a different matter, as while it will probably remain in GOP control, a tied or Democratic controled Senate are both possible.
