As things stand right now, it seems unlikely that Mr. Bush won the election.
There are two major categories of problems. One affects the electoral vote. Release of the final exit polls conducted in all states shows a pattern that cannot be explained away.
http://www.scoop.co.nz/mason/stories/HL0411/S00227.htm
The exit polls were released (not to the general public) at 4:00 p.m. on Election Day by polling consultants Edison Media Research and Mitofsky International.
These are the genuine exit polls for all 50 states and the District of Columbia, taken before the outcome was known in any particular state. These are not the "exit polls" that organizations including CNN went back and retroactively changed after the election, making them conform more to vote tallies.