On a conference call today, Mark Penn -- the senior adviser to Sen. Hillary Clinton, D-NY, declared that Sen. Barack Obama, D-Illinois, can't win the general election. Penn says that Obama can't win Pennsylvania, a primary which is key to the general. "We believe fundamentally it provides a very test of who can really win the general election," Penn says. "We believe this will again show Hillary is ready to win and Senator Obama really can't win a general election." After a reporter presses for clarification, the Clinton campaign denied Penn made the statement and Penn clarifies, saying: "I think...