“Thanks for the endorsement, Bill,” Mrs. Clinton said to Mr. de Blasio, a former aide who dallied in getting behind the former New York senator. “Took you long enough.” “Sorry, Hillary,” Mr. de Blasio said. “I was running on C.P. time,” a reference to the stereotype “Colored People Time” that drew some cringes from the audience. Mr. Odom, who is black, interrupted: “That’s not, I don’t like jokes like that, Bill.” Mrs. Clinton jumped in. “Cautious politician time. I’ve been there,” she said.