The Democratic National Convention’s second night is highlighting the party’s past presidents, particularly Chicago’s own Barack Obama, and tying them to Vice President Kamala Harris. The Democrats on Tuesday also are all-in on promoting cross-party appeal, featuring a former Donald Trump spokeswoman and a Republican mayor from the battleground state of Arizona. Harris and running mate Tim Walz have ducked out of Chicago to hold a rally just up the interstate in Milwaukee. They're wooing voters in swing state Wisconsin, a recognition that this presidential election is expected to be razor-close.