LOS ANGELES - President Donald Trump won Pennsylvania by a narrow margin in 2016. It’s considered a complicated state to categorize due to its historical swing status, and “right now, Pennsylvania looks like the single most important state of the 2020 election,” polling analysis website FiveThirtyEight said.Why is that?According to FiveThirtyEight’s presidential forecast, Pennsylvania has a 31 percent chance of being the tipping-point state, which is what happens when you give one of the most evenly divided states in the union 20 electoral votes.RELATED: Arizona, long considered a GOP stronghold, could be swing state in 2020 presidential election, experts sayExperts say the Keystone State continues to change and has increasingly become.