nytimes.com – Photo The Rev. Al Sharpton, who came to prominence as an imposing figure in a track suit, shouting indignantly at the powerful, stood quietly on a stage last month at the Four Seasons restaurant, his now slender frame wrapped in a finely tailored suit, as men in power lined up to exclaim their admiration for him. Mayor Bill de Blasio and Gov. Andrew M. Cuomo hailed him as a civil rights icon. President Obama sent an aide to read a message commending Mr.