Obama Has the Big Mo— But Can He Be Stopped?

With a week of sweeping victories, culminating yesterday in Potomac wins that show him cutting into the heart of Hillary Clinton's base, newly crowned front-runner Barack Obama now has a strong case that the Dems should coalesce around his candidacy, Adam Nagourney writes in the New York Times. He now leads in funding, states, and delegates. But don't count Hillary out too early.

David von Drehle of Time likens Clinton to an immovable rock against which the wave of Obama's momentum has crashed before—after Iowa and South Carolina. But both think the momentum will hold this time, and time is in Obama's favor: Clinton's big shot at a comeback, in the Ohio and Texas primaries, is 3 weeks away, which may be too long for voters to resist the perception that he's unstoppable. (More Barack Obama stories.)