On the heels of a tumultuous Republican convention, Hillary Clinton arrives in Philadelphia eager to show off a forward-looking Democratic Party united behind her steady leadership. To do that, she must overcome lingering bitterness among supporters of defeated rival Bernie Sanders and clean up a resurgent political mess of the party's own making.
02:02Sen. Tim Kaine is using his debut appearance as Hillary Clinton's running mate on Saturday to introduce himself to voters. He offered a tough assault on Donald Trump, and then added that Clinton is the opposite of him.