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PITTSBURGH, PA - MARCH 6: Former Vice President Joe Biden speaks at a rally in support of Democratic congressional candidate Conor Lamb Tuesday March 6, 2018 at Robert Morris University in Pittsburgh. Lamb is running in a tight race for the vacated seat of Congressman Tim Murphy against Rick Saccone. President Donald Trump plans to visit Pennsylvania's 18th Congressional District March 10, 2018 in a bid to help  Saccone. (Photo by Jeff Swensen/Getty Images)
PITTSBURGH, PA - MARCH 6: Former Vice President Joe Biden speaks at a rally in support of Democratic congressional candidate Conor Lamb Tuesday March 6, 2018 at Robert Morris University in Pittsburgh. Lamb is running in a tight race for the vacated seat of Congressman Tim Murphy against Rick Saccone. President Donald Trump plans to visit Pennsylvania's 18th Congressional District March 10, 2018 in a bid to help  Saccone. (Photo by Jeff Swensen/Getty Images)

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    Biden campaigns for Conor Lamb in Pennsylvania

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Biden campaigns for Conor Lamb in Pennsylvania

Former Vice President Joe Biden rallied support for Democrat Conor Lamb's bid to win back voters in Western Pennsylvania that abandoned their party in droves in recent elections. CNN's Jason Carroll reports.

Biden campaigns for Conor Lamb in Pennsylvania

Former Vice President Joe Biden rallied support for Democrat Conor Lamb's bid to win back voters in Western Pennsylvania that abandoned their party in droves in recent elections. CNN's Jason Carroll reports.