48% have yet to form an opinion on Bloomberg, and strategists say endorsements from black leaders will be critical for his campaign.

Billionaire Michael Bloomberg on Sunday launched his campaign for the Democratic presidential nomination, one week after publicly apologizing for overseeing “stop and frisk” during his tenure as mayor of New York City.

“I want you to know that I realize — back then, I was wrong, and I’m sorry,” Bloomberg told a predominantly black audience at the Christian Cultural Center in Brooklyn on Nov. 17, the first time he has distanced himself from the policing policy that angered many black Americans, one of the Democratic electorate’s most important voting blocs.

The apology isn’t having an immediately measurable impact on black voters, according to Morning Consult polling. Thirty percent of black Democratic primary voters said they had a favorable view of Bloomberg in surveys conducted Nov. 18-24, compared with 23 percent who had an unfavorable view — figures that are statistically unchanged from responses collected Nov. 11-17. The surveys respectively sampled 786 and 1,430 registered black voters who indicated they may vote in a Democratic primary or caucus in their state. The Nov. 18-24 sample has a margin of error of 4 percentage points, and the Nov. 11-17 sample has a 3-point margin of error.