A note on "liberal apathy"

Regarding my most-recent post about Jonathan Cohn's TNR piece: I realized I never really addressed the "liberal apathy" charge which was right there in Cohn's title. That's largely because I was so gobsmacked over Cohn's assertion that liberals should "show enthusiasm" (i.e. - clap appreciatively) when Obama or congressional Democrats do something right, something we agree with and support...