What to watch in Tuesday's primaries as Graham Platner tries to clinch Senate nomination in Maine (opens original article in a new tab)

Maine's Senate primary focuses on Graham Platner's efforts to secure the Democratic nomination amid controversy, while other states hold primaries with key political figures and family ties influencing races.

• Graham Platner seeks Senate nomination in Maine despite controversy over past behavior.
• Maine's Democratic Party faces scrutiny over its standards following Platner's allegations.
• Trump's influence is tested in South Carolina and Nevada primaries with endorsed candidates.