Republicans and Democrats in Nevada, North Dakota and South Carolina select their nominees on Tuesday, but much of the nation's political focus will be on Maine. Democrat Graham Platner is expected to emerge from the primary to take on five-term incumbent GOP Sen. Susan Collins. But Platner has faced one scandal after another during the campaign. Geoff Bennett discussed more with Alex Seitz-Wald.

Voters across Maine, Nevada, South Carolina and North Dakota head to the polls Tuesday for another day of primary elections in America, but much of the political world will be focused on Maine's high-stakes U.S. Senate contest.

Graham Platner is seeking to make a Democratic nomination for U.S. Senate official in advance of one of the most anticipated contests of the year.

Primaries for U.S. Senate and U.S. House on Tuesday will set the stage for a midterm general election in which Maine is expected to play a critical role in deciding control of both chambers.

President Trump should endorse Graham Platner, a Democratic nominee for U.S. Senate in Maine, to further his agenda of humiliating Republicans and rewarding candidates who are vessels for populist rage.

President Trump should endorse Graham Platner, a Democratic nominee for U.S. Senate in Maine, to further his agenda of humiliating Republicans and rewarding candidates who are vessels for populist rage.