Vice President Kamala Harris is launching a targeted effort to court Republican voters in rural Pennsylvania. Why it matters: It's a sign that the Harris campaign is not only aiming to surge Democratic turnout in vote dense Philly and Pittsburgh but also trying hard to blunt former President Trump's margins in swing or red counties across the commonwealth.

Pennsylvania, the Keystone State, could well be the keystone for the election. Where it falls will likely be determined by which of its political regions turns out in the greatest numbers.