Maybe it’s because Twitter puts a premium on brevity and cleverness. I don’t know. But for some reason, it seems to be a natural medium for conservatives. We saw it when the Hilary Rosen interview (“Ann Romney never worked a day in her life”) prompted a Twitterstorm. We saw it again when #ObamaEatsDogs exploded, and when #Julia blew up in the White House’s face like an exploding cigar. Currently, the White House is promoting #AskMichelle, where loyal Democrats can go to ask the First Lady a question. Only nearly all of the questions have come from conservatives. A sampling…