Kamala Harris and Donald Trump are doing last minute prepping for their high-stakes debate tonight. The event has heightened importance, with a new Sienna College/New York Times poll showing the race in a dead heat. It’s likely to be their only debate before Election Day in November. It’s taking place in Philadelphia, with Pennsylvania being the state that could determine who wins the presidency. ABC News is the host, but every network will carry it starting at 9 pm Eastern, and it won’t have an audience, live microphones, or written notes for the candidates.