When "all or nothing" equals "nothing"

So, Lieberman lost. A Democratic icon falls to a billionaire with no political experience. Those no-good Republicans always used big money instead of ideas, it's a crying . . . .

Oh, wait a minute. Lieberman lost to another Democrat? (I mean, if a billionaire businessman with no political experience can be considered a Democrat in the strictest sense of the word . . . ) Oh.
Huh.
So, let me get this straight. The Republicans are in disarray, lots of scandals, lots of discontent over the war . . . and the Democrats are splitting into angry factions over the war . . . and MoveOn.org thinks this is a good thing because . . . ?