'ABSURD'
Obama's campaign quickly labelled Wolfson's comments "absurd."
"After weeks of badgering the media to 'vet' Senator Obama, the Clinton campaign believes that they should be held to an entirely different standard," Obama spokesman Bill Burton said.
"We don't believe that expecting candidates for the presidency to disclose their tax returns somehow constitutes Ken Starr-tactics, but the kind of transparency and accountability that Americans are looking for," he said.
The Obama campaign said more than $54 million of his February donations were for the primary campaign battle with Clinton. It included more than 385,000 first-time contributors, bringing the total number of donors to more than 1 million.
With 12 contests remaining, Clinton still faces a difficult task in overcoming Obama's lead in pledged delegates who will choose the nominee at the convention.
But Obama also is unlikely to reach the 2,025 delegates needed to win, turning attention back to their efforts to woo 796 "superdelegates" - party officials and insiders - who are free to back any candidate and could make the difference in the race.
It also renews the focus on the states of Florida and Michigan, which were stripped of their delegates in a dispute with the national party but held unsanctioned contests anyway.
Talks have resumed about the possibility of a "do-over" in those two contests, which Clinton won even though no candidates campaigned. Obama was not even on the Michigan ballot. The two campaigns, the state parties and the national party would have to agree on the formats and timing of new contests.
Florida Sen. Bill Nelson, a Democrat, called for a new primary in the state and said the national party should pay for it. "We can't go on and ignore two of the largest and most important states," he said.
The next contests in the Democratic race are on Saturday in Wyoming, which has 12 delegates at stake, and Tuesday in Mississippi, which has 33 delegates at stake. The race will then have six weeks until the next battle in Pennsylvania on April 22.
Clinton, looking to emphasize national security, held a meeting in Washington with top military leaders and experts such as former U.N. Ambassador Richard Holbrooke, former Navy Secretary John Dalton and several retired officers who voiced their support.
