Graham Platner won the Democratic primary for Senate in Maine and quickly turned his populist message against Susan Collins, the Republican incumbent.

© Sophie Park for The New York Times

Mr. Graham, a four-term incumbent, is the favorite to win the general election in a solidly Republican state.

© Demetrius Freeman for The New York Times

The ascendancy of Todd Blanche shows how the practices that were initially deemed out of bounds even in President Trump’s Justice Department seem to be the order of the day.

© Doug Mills/The New York Times

Once one of President Trump’s fiercest critics, the South Carolina senator has dramatically shifted his posture over the years. Will it pay off on Tuesday in his primary?

© Tierney L. Cross/The New York Times, Haiyun Jiang/The New York Times