Democratic presidential candidates Barack Obama and Hillary Clinton participate in their debate hosted by ABC in Philadelphia, Pennsylvania, April 16, 2008. (EMMANUEL DUNAND/AFP/Getty Images)
President, U.S. Senate, Congress, and the Minnesota House of Representatives are the major races in the campaign of 2008. This is the first presidential election without an incumbent or sitting vice president involved since 1952.
Sharp barbs in Pennsylvania debate
Days before the Pennsylvania primary, Democratic presidential candidates Hillary Clinton and Barack Obama participated in what was perhaps their last debate.
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