Arlen Specter’s decision to switch parties puts the Democrats one seat closer to a filibuster-proof majority in the Senate. Why the independent-minded senator is changing his political affiliation and what it means for the president’s agenda and the future of the G.O.P.


  • Stuart Rothenberg Editor and publisher of the Rothenberg Political Report
  • David Winston Republican pollster and President of the Winston Group. He also writes for Roll Call and is a CBS News consultant.
  • Susan Page Washington bureau chief for "USA Today"
  • Tad Devine Political consultant; senior strategist to the 2004 Kerry campaign and to the 2000 Gore campaign; director of delegate selection in the 1988 Dukakis campaign.

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