President Trump attacked Pennsylvania Rep. Conor Lamb (D) in a pair of tweets Saturday morning that endorsed Lamb's opponent, Rep. Keith Rothfus (R-Pa.), in the battle for the state's newly drawn 17th District. Trump tweeted his support for Rothfus on Saturday as Vice President Pence headed to the state to campaign for Rothfus. He also resurfaced a nickname for Lamb, "Lamb the Sham." The two congressmen are dueling for the newly drawn district, currently held by Rep. Matt Cartwright (D), who himself was redistricted to Pennsylvania's 8th District. ".@VP Pence is heading to Pittsburgh, Pennsylvania where we have both strongly...