U.S. Sen. Doug Jones, a Democrat who pulled off a stunning political upset in Alabama two years ago, launched his reelection bid Sunday, seeking to create another Deep South victory in a Republican-dominated state.

Iowa's caucus-reporting meltdown was painful. But another grenade from Monday night, just beyond the line of sight, may be just as consequential. For more than a year, Democrats have been preparing for high turnout in 2020