HARRISBURG - With barely two weeks left before Election Day, the battleground state of Pennsylvania is being flooded with visits by the presidential candidates and their campaign surrogates.Recent polls show President Donald Trump and former Vice President Joe Biden in a competitive race in Pennsylvania, or Biden ahead by single-digits in a state Trump won by just over 44,000 votes — less than a percentage point — in 2016.Former President Barack Obama will campaign in Philadelphia on Wednesday, returning to a city that produced historically large margins of victory for him in his 2008 and 2012 campaigns.RELATED: Judge rejects GOP attempt to shut down early voting center in Delaware CountyDoug Emhoff, the husband of Democratic vice.