they ran on one issue; ending the war*. and the war continues. even worse, in the view of the DUmmies, at least, the war is succeeding. I love the moral calculation on that one, "why, oh WHY didn't you stop the war before we won it?" 
I am sure they want them voted out for lack of treason and failure to groundlessly impeach the president.
*well, two issues. ending the war and hating george bush. and both are still there.
Some metropolitan democrats may have ran and won on "ending the war", but that is not what won the democrats their tiny useless majority. Many of the new democrats had to run as Reagan's Ghost in order to be elected. The "mandate" to "end the war" is a lie which has been used so often it has become the truth (except to we with a memory).
their margin was indeed microscopic nationally. this is from my word document of useful factoids (I don't remember where I found it, I didn't preserve the link to this one for some reason):
The Democratic victory in 2006 was narrow. They won the House by 85,961 votes out of over 80 million cast and the Senate by a mere 3,562 out of over 62 million cast.
but I think they absolutely ran on ending the war. that's what the exit polls said (yes, those things that elected both president gore and president kerry

) was the number one issue by a pretty large margin, and it is manifestly what the national dems were saying; indeed, it was all they said. they certainly
thought they were running to end the war.
I agree with you that their margin in the house was supplied by blue dog democrats. but they are democrats nonetheless.