re: "the exit polls were reasonable correct and something else was wrong. Which if true will mean there will only be one party for now on"
Try modeling a race where computers choose the winner and this is what you get.
Exit polls and predictions going one way and the results another. Paradoxically it could also happen in a completely fair race.
Problem is Bush never has played fair in his life. Not that the DNC has always played fair either. Illinois in 1960. The RNC won we will never know. But if every race for the rest of this millennia goes RNC I wouldn't be surprised.
As Larry has pointed out the reverse with the DNC holding both congress and the POTUS has existed. We go in cycles. So expect a different out come sometime in the future of course you can rationalize anything if you want to look at your voting Bush back in.