Mr. Cuomo, the front-runner in the mayoral race and former governor, has a long — and, his critics say, mixed — record handling important issues in the city.

Representative James E. Clyburn of South Carolina is endorsing former Gov. Andrew M. Cuomo in the New York City mayor’s race as the June 24 primary nears.

Mr. Cuomo, the front-runner in the mayoral race and former governor, has a long — and, his critics say, mixed — record handling important issues in the city.