A new InsiderAdvantage/FOX 29 Philadelphia poll shows Dr. Mehmet Oz in the lead by a narrow margin in a tight race for the Republican nomination for U.S. Senate. The poll, which surveyed 750 likely GOP Primary voters, shows just how tight the race is between the top three candidates. Oz leads the race followed closely by Kathy Barnette, who moved into second place after the debate on April 25, according to InsiderAdvantage. The poll puts Oz at 22.5% and Barnette at 20.9%, followed by Dave McCormick at 18.5%. Candidates Jeff Bartos and Carla Sands are nearly tied at 4.9% and...