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Tuesday, Aug. 4, 2009 | 5:30 p.m.
What did they know, and when did they know it? That is the question facing Republicans amid the revelation that GOP staff knew about U.S. Sen. John Ensign's affair with a former staff member before the 2008 election. Jon asks conservative political consultant Steve Wark and liberal blogger Erin Neff about that and a court ruling that could change the face of political campaigns in Nevada.