“Hillary Clinton won big victories Tuesday night in Ohio, Texas and Rhode Island. But she’s now even further behind in the race for the Democratic nomination. How could that be? Math. It’s relentless.” Seemingly a rarity among pundits at the moment, Newsweek‘s Jonathan Alter does the post-Tuesday math, and makes the case I outlined yesterday: the race for the Democratic nomination is over, and Barack Obama has won. “I’ve asked several prominent uncommitted superdelegates if there’s any chance they would reverse the will of Democratic voters. They all say no…The Clintonites can spin to their heart’s content about how big March 4 was for them. How close the race is. How they’ve got the Big Mo now. Tell it to Slate’s Delegate Calculator. Again.“