Look, the Dems didn't run anything. They ran on "we aren't the other guys".
It worked because of how unpopular the repubs are due to the war.
The problem they have is that they seem completely unable to even get along with each other and set an agenda, much less stick to one.

I think many Dens underestimate how narrow their wins were as well. The approval rating of the President was so low, and diapproval for the war very high. Despite this, the key senate wins and house wins were by very small margins. The Dems have never accpeted responsibility for their many losses in both congressional and presidential elections. It was always " they cheated", "they counted the votes wrong" that they blamed. They just couldn't accept the fact that your average American wants nothing to with liberal stances. So who do they make majority leader? Pelosi!!!! LOL!!!
They just don't get it. They seem to be unwilling to make a move to the middle, and the parties leaders are still hard left.
That election was not a mandate. They can't just sit in office and do nothing for two years and expect to keep the majority. Yet I think thats exactly their plan.
The "plan" seems to center around doing as little as possible for two years and just trying to keep control of congress in '08. Stall on anything controversial, and smile.
Its not gonna work. I don't think the last election was a vote on Repubs/Dems. It was a vote on the war and Bush. Bush won't be running in '08 and his weight won't drag anyone down.
In addition, the new lows set by Dems in campaign tactics were surprising to even hardened and grizzled veterans of politics. They reached for as much dirt as they could find on opposing candidates, and told tales that were not only untruthful, but in some cases outright lies.
Now that they have lowered the standards of just how low you can go in campaigning, expect the Repubs to come out swinging with just as much dirt on Dems in the next election.
This congressional control has two years written all over it.