What to watch on the campaign trail todayVice President Kamala Harris and Minnesota Gov. Tim Walz hit the campaign trail together in their first full day as running mates. They are scheduled to hold rallies in the battleground states of Michigan and Wisconsin.Former President Donald Trump's running mate, Sen. JD Vance of Ohio, has an itinerary that's almost identical to that of Harris and Walz. Vance is rallying supporters in the same two states, even the same cities, but without Trump.Independent presidential candidate Robert F. Kennedy Jr. is in court today to fight a lawsuit by a group challenging the New York address he lists as his home on ballot access petitions.