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With two days to go before a crucial U.S. presidential vote, Democrats Barack Obama and Hillary Clinton campaigned through Pennsylvania on Sunday (April 20, 2008) as the former first lady got the support of one of her fiercest critics. With less than 48 hours to go before the polls open, the two campaigned vigorously around the state, both claiming the other was conducting a negative campaign. At a rally in Bethlehem, Clinton said it was Obama who had gone negative since their Philadelphia debate last week. "He has sent out mailers, he has run ads misrepresenting what I have proposed," she said "The last thing we need is somebody spending as much money as he has downgrading universal healthcare." Both candidates have unveiled new commercials aimed at one another. In one Clinton campaign commercial an announcer says, "There are more and more questions about Barack Obama." The Obama campaign commercial featured a photo of Clinton with a scrolling list of companies the campaign claims made major donations to the Clinton campaign. Tuesday's primary to help pick the Democratic candidate against Republican John McCain in November's presidential election is the first contest in six weeks and has become a major test in the race to the party's nomination. Clinton, a New York senator, leads in state polls but Obama, an Illinois senator, has cut into her one-time double-digit lead in recent weeks. Clinton, who with her husband former President Bill Clinton was the subjects of ma...