The former first lady enters this week with an insurgent strategy not only to win over undecided superdelegates but to peel away Obama's support from those party leaders and elected officials who already have committed to back him for the nomination.

"Whatever differences Senator Clinton and I may have, those differences pale in comparison to the other side," he said.

But Clinton argues she now leads in the popular vote - a debatable point given that she relies on Michigan and Florida outcomes. None of the candidates campaigned in either state and Obama received no votes in Michigan because he removed his name from the ballot. Clinton also continues to present herself as better able to confront McCain in the fall.

She and her campaign's national chairman, Terry McAuliffe, both made it clear Sunday night that Obama's supporters were now fair to pluck with those arguments.

To drive the point home, Clinton invited Virgin Islands superdelegate Kevin Rodriguez, a recent convert,