President Biden and former President Donald Trump are locked in a statistical tie as they gear up for the first of two scheduled debates next month, but nearly one-fifth of voters say they could still change their mind about for whom they ultimately pull the lever. In a one-on-one matchup, Biden garnered 48% support to Trump’s 47%, according to a Quinnipiac University national poll of registered voters released Wednesday. Last month, the survey found Trump and Biden in a flat-footed tie, with each receiving 46% support. Despite the incumbent’s lead, history suggests the margin would be tight enough for Trump...