Democrats exchange fire over financial disclosure, negative campaigning

Strategists for Democratic hopefuls Barack Obama and Hillary Rodham Clinton exchanged calculated barbs Sunday over accountability, ethics and personal attacks. Obama communications director Robert Gibbs called on Clinton to release full post-White House tax returns; disclose all congressional "earmarks," or pet projects she had inserted into spending bills; and to release all documents pertaining to activities of the Clinton Foundation and Clinton Library, including a list of donors. Senior Clinton strategist Mark Penn countered, suggesting the Obama campaign was trying to "deflect public opinion from their losses in Ohio and Texas" and faced overwhelming Clinton strength in Pennsylvania. "This is a tried and true technique of the Obama campaign that has repeatedly shifted negative when they find the momentum working against them," Penn said.