Basically the only benefit President Obama got from being trounced in the first debate is that it has significantly lowered exceptions for the second debate this evening. From Pew Research:

By an almost two-to-one margin voters expected Obama to win the first debate but now voters are basically split on who they think will win the second debate. At least part of what made Romney’s first debate performance so powerful was that few expected him to do as well as he did.

Not surprisingly, partisans mostly expect their candidate to win the debate but the big change has been among independents. Independents expected Obama to win the first debate 44% to 28%, but now 42 percent of independents expect Romney to win the debate and only 31 percent expect Obama to win it.