These should be happy times for liberals and the Democratic party as a whole. They control the White House and both houses of Congress, while opposition Republicans are leaderless and lost. So why do some Democrats, particularly those farther to the left, appear so angry?

If you doubt it, just watch a few minutes of MSNBC, where the recent nationwide series of “tea parties” to protest federal spending and taxes set off an angry, almost manic response. The most telling came on Keith Olbermann’s program, during which the actress Janeane Garofalo, who plays an FBI computer geek on “24,” denounced the tea parties as “racism straight up.”