Unlike Monstrachaka in comments, I think it was a draw at best for the Repubs. Edwards was too appealing and he landed some serious punches. The big mo of Big John continues.

...Andy Sullivan thought it was Edwards in a landslide:

Boy was I ever wrong. If last Thursday night's debate was an assisted suicide for president Bush, this debate - just concluded - was a car wreck. And Cheney was road-kill. There were times when it was so overwhelming a debate victory for Edwards that I had to look away. I have to do C-SPAN now, but stay tuned for more post-debate blogging in a little while.

Even when he admitted that he finds Cheney sexier...

...Kevin Drum has this to say:

You know, after taking the time to write all this stuff down, I'm beginning to think Edwards did better than I initially gave him credit for. Basically, he put Cheney on the defensive on Iraq and demonstrated clear superiority on domestic issues. That's not bad.

So score it a modest victory for Edwards, especially since he was the one who had to prove he could hold his own. It probably won't make a big difference in the polls, but even a small difference could be important. The Kerry team is probably pretty happy with how things went tonight, and it definitely puts additional pressure on Bush to perform well on Friday.

...Kos has the instant polls:

CBS:

CBS News tracked the reactions to tonight's vice-presidential debate of a nationwide panel of 169 uncommitted voters - voters who could change their minds before Election Day. Here are the initial results. This scientific poll has a margin of error of plus or minus 7 percentage points:

By 41% to 29%, uncommitted debate watchers say Edwards won the debate tonight.

ABC:

Who won? (among debate viewers)

Cheney 43%
Edwards 35%
Tie 19%

So ABC has Cheney winning. Um, until you look at what follows:

Party ID of debate viewers

Democrats 31%
Republicans 38
Independents 27

Whoops! A seven-point gap in debate viewers' party ID and an eight-point Cheney win. Well.