Last night proved another good one for Barack Obama, as he extended his winning streak over Hillary Clinton to 10 with victories in the Hawaii caucus and Wisconsin primary.

Hillary Clinton has now failed to win a single state since Super Tuesday, and her campaign now rests on the March 4th states of Ohio and Texas. Both states favour her demographically - but so did Wisconsin, where nearly six-in-ten voters were women; nine in ten were white; forty percent earned $50,000 or less; and 58 percent had no college degree. In each of those categories - key blocs in the Clinton coalition - Obama ran ahead or only marginally behind Clinton. Among women Clinton took 51 percent to 48 percent for Obama; among white voters he won 52 percent to 46 percent; among those earning less than $50,000 he won by seven points; and among those without a college degree Obama won 54 percent to 45 percent.

Is Clinton doomed? Absolutely not. Wins in both Texas and Ohio would breathe new life into her campaign. David Brooks in the New York Times senses a certain amount of Obama fatigue, while there are signs that the positive media that Obama has been receiving may be starting to wane - see here and here. It will be an interesting fortnight until March 4th...