Alexandria Ocasio-Cortez says she hasn't decided whether to run for president, but the New York congresswoman is making new moves toward a possible White House bid. Ocasio-Cortez launched a national tour in recent weeks — without calling it one. Why it matters: Whether AOC jumps into the race is one of the biggest X factors in the 2028 Democratic primary. Democratic operatives expect she would easily raise $100 million just from small-dollar donors, mobilize many supporters of Vermont Sen. Bernie Sanders' past campaigns, and command attention as few other candidates could. Driving the news: Just in May, Ocasio-Cortez has: Rallied voters in Philadelphia for a left-wing congressional candidate in a competitive primary. Spoken at a rally in Montgomery, Ala., about voting rights. Addressed the historic Ebenezer Baptist Church in Atlanta with Georgia Sen. Raphael Warnock. (Democrats note that Warnock, the church's senior pastor, doesn't always allow visiting politicians to speak at this church.…