Former President Barack Obama will hit the campaign trail with Vice President Kamala Harris in the final month leading up to the election. Harris, who appears to be losing momentum, needs all the help she can get to stave off former President Donald Trump’s potential return to the White House. Obama’s first event will occur Thursday in Pittsburgh, Pennsylvania, the beginning of a swing-state “blitz” through Election Day, a senior campaign official told establishment media outlets Friday. Polling shows Harris and Trump are within the margin of error in the Keystone State, although Republicans appear to be picking up momentum...