Well, seeing as they're making loud noises about all these investigations and such like, and not much else (admittedly I've not heard, or tried to find out, much since the election and its aftermath), it will depend on whether they catch the Republicans out and nail some Bad Stuff on them.
If the enquiries go well enough, they should be OK. Hard to be apathetic when you're government is falling apart around you. It's not something I'd like to have as my main election campaign, though.
The Democrats have definitely got the hardest job to do in the next few years. They've got to show the Republicans up for what most people think they are; present themselves as a better option with new ideas of their own and force positive changes regarding Iraq. Tough job! I doubt they can/will do it...