Obama remains the Democratic Party's best motivator nearly a decade after leaving the White House. And he's taking his star power on the road in the final days of the midterm elections, which will help determine the balance of power in American politics on Nov. 3.
The 44th president sharply criticized Mr. Trump, who hit back later in the day. Mr. Obama also assailed Vivek Ramaswamy, the Republican nominee for governor of Ohio.