MYTH: Joe Lieberman’s victory proves the netroots don’t matter.
REALITY: The netroots had some key victories.
MYTH: Democrats won because they carefully recruited more conservative candidates.
REALITY: Democrats won because their candidates were conservative about their message.
MYTH: The losses Republicans sufferend this election were no different than what you usually see in a President’s sixth year in office.
REALITY: Redistricting minimized what might have been a truly historic shellacking.
MYTH: The election was all about the war.
REALITY: It’s the dishonesty, stupid.
MYTH: Republicans lost their base.
REALITY: The base turned out, they just got beat.
I think the war was probably at least as important as corruption in the Democratic victory, but this is still a pretty good list. Read the whole thing for more detail.