The Gallup poll, despite still heavily over-sampling Republicans, shows that Kerry scored the biggest debate victory since Ross Perot in 1992):
More Favorable Opinion of Candidate After the Debate
2004
Bush Kerry
9/30 21 46
2000
Bush Gore
10/17 31 29
10/11 40 24
10/3 34 27
1992
Clinton Bush Perot
10/19 27 29 63
10/11 29 13 62
On top of that, the number of people watching the Debate was huge, so last night was really big for Kerry.