Over a million people have already voted in the state of Arizona with more than half of them Democrats. NBC News' Vaughn Hillyard reports from Arizona State University where the first on-campus early voting center opened today. President Trump cast his ballot Saturday in Florida, as some form of voting is underway throughout the country. CBS News correspondent Nikole Killion and Sean Sullivan, national politics reporter for The Washington Post CBSN political contributor, joined CBSN with the latest on the upcoming election. In Erie County, Pa. — a swing county in a battleground state — voters and election officials are trying to navigate the challenges of holding an election in the midst of a pandemic. In US presidential elections, the vote in certain states is predictable. But in others - known as swing states - there can be surprises. Our correspondents Jessica Le Masurier and Céline Bruneau travelled to the key battleground states of Minnesota and Wisconsin to see whether voters in America's heartland will choose Donald Trump or Joe Biden as their next president.