Senators Barack Obama and John McCain tussled directly Friday over how they will pay for their campaigns, with Mr. McCain challenging Mr. Obama to abide by his earlier pledge to use public financing for his general election if Mr. McCain does so as well.
The squabbling marked the first time the two have directly confronted each other on the issue, which revolves around Mr. Obama's February 2007 pledge to accept public financing -- and the spending limits that accompany it -- if he went on to the general election and his Republican counterpart likewise accepted public financing.
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