Voters waited more than 2 hours in a line that snaked through a ballroom at Sun City Anthem in Henderson, Nev., on Monday. It was one of many early caucus sites where voters faced long lines.

Voters waited more than 2 hours in a line that snaked through a ballroom at Sun City Anthem in Henderson, Nev., on Monday. It was one of many early caucus sites where voters faced long lines.