Mamdani's power play, a Kennedy's TikToks. Four things to watch in Tuesday's primaries

New York Mayor Zohran Mamdani is backing far-left candidates against mainstream Democrats, potentially clashing with House Minority Leader Hakeem Jeffries. Meanwhile, vulnerable Republican Mike Lawler awaits his challenger in a key House flip target district. In South Carolina, Donald Trump has endorsed both gubernatorial runoff candidates, Pamela Evette and Alan Wilson, amidst mixed results for his endorsements elsewhere.