WASHINGTON — The Congressional Black Caucus, a power center in the Democratic Party for decades, saw its membership rise this Congress to an all-time high of 58 House members. Now, thanks to a Supreme Court redistricting ruling that’s expected to dramatically diminish Black representation on Capitol Hill, the CBC is fighting a five-alarm fire that could devastate its membership. CBC Chair Yvette Clarke, D-N.Y., said as many as 19 of the caucus’ members could be affected by the redistricting