WASHINGTON — Dozens of Democrats across the party’s political spectrum quickly endorsed Kamala Harris for president over the last 72 hours, but Sen. Bernie Sanders, I-Vt., says he’s not ready to join them just yet.

Sanders said Tuesday evening that he hopes Harris will defeat Donald Trump in November, telling reporters: “I’m gonna do everything I can to make sure that she becomes president” — but with a caveat that he needs to see more from her.

Sanders stopped short of an endorsement,…