Graham Platner seeks Democratic Senate nomination in Maine, and more primary races to watch today

Key Points:

• Maine's Democratic Senate primary is highly contested as Graham Platner seeks the nomination to challenge incumbent GOP Sen. Susan Collins, despite recent allegations of inappropriate behavior and past controversies; national Democrats remain divided in their support.
• In Maine's 2nd Congressional District, Democrats aim to retain Rep. Jared Golden's seat, with Joe Baldacci favored to win the primary against three challengers, while former Governor Paul LePage runs unopposed for the Republicans.
• Maine's open governor's race features multiple candidates from both parties due to term limits for incumbent Janet Mills, with ranked-choice voting playing a key role; the race is rated Likely Democrat by the Cook Political Report.
• South Carolina's GOP gubernatorial primary includes several candidates vying to replace term-limited Gov. Henry McMaster, with Trump's endorsement going to Lt. Gov. Pamela Evette, while the Democratic primary is less competitive in this reliably Republican state.
• Nevada's Republican Gov. Joe Lombardo faces a challenging reelection bid against Democrats Aaron Ford and Alexis Hill, with the state's evolving political landscape making the race a key target for Democrats aiming to flip the governorship.