April 16, 2008:
In a tense debate in Philadelphia just six days prior to the Pennsylvania Democratic primary, Sen. Hillary Clinton challenges Sen. Barack Obama on his record, focusing on Obama's relationship with his former pastor, the Rev. Jeremiah Wright, and his connection to the former radical Bill Ayers, as well as his comments in San Francisco earlier in the month that many small-town voters are "bitter" and "cling to guns or religion or antipathy to people who aren't like them."
Earlier, Clinton had called those comments "elitist, out of touch and, frankly, patronizing." At the debate, Obama concedes that he had "mangled up" his remarks.
It was, by many accounts, Obama's worst debate performance. Clinton will win the Pa. primary on April 22 but she ultimately loses the nomination to Obama.
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