Voters are going to the polls Tuesday for primaries in several states, including in the key battleground states of Georgia and Pennsylvania, while in Kentucky, Trump foe GOP Rep. Thomas Massie faces a challenger backed by the president. In Alabama, voters are weighing in on four out of seven House races, while the other three districts will vote in August, after a Supreme Court decision earlier this month made it possible for the state to use a different congressional map with just one majority-Black district. Here's what to know about the key races:Kentucky 4th District Massie faces challenger Ed Gallrein in the 4th Congressional District in northern Kentucky in what has become the most expensive House primary in history. In an interview with CBS News' Ed O'Keefe in his hometown of Vanceburg, Kentucky on the eve of the primary, Massie said of Mr. Trump, "He knows I'm tough to beat." "He's literally losing sleep over this race, because he's in with both feet," Massie said. I think their polling shows what our polling shows, which is there's a better than half chance that we're going to win this race." n an interview Monday in his hometown of Vanceburg, Kentucky. Massie later predicted, "I'm going to win," but he admitted it's a tight race.