Surfer that he is, President Obama should know a riptide when he's in one. The center usually is the safest, most productive place in politics, but perhaps not now, not in a once-in-a-century economic crisis. Swimming in the middle, he's denounced as a socialist by conservatives, criticized as a polite accommodationist by government-is-the-answer liberals, and increasingly, dismissed as being in over his head by technocrats. Luckily for Obama, the public still likes and trusts him, at least judging by the latest polls, including NEWSWEEK's.But, in ways both large and small, what's left of the American establishment is taking his measure...