Hundreds of early voters at the African-American Research Library and Cultural Center pepped up when Hip-Hop royalty appeared unexpectedly, urging voters to support Barack Obama for president. Mary J. Blige, Jay-Z and Beyonce, Diddy and Russell Simmons had voters screaming, reaching for cell phone cameras and forming a throng around the library on Sistrunk Boulevard when the stars arrived in a fleet of black SUVs to shake hands, take pictures and stump for Obama. The unannounced appearance was a scaled-down version of what was supposed to be a "Last Chance for Obama" rally at the War Memorial Auditorium in Fort Lauderdale and in Miami Gardens today. The 15-minute appearance was more than enough time to boost the spirts of waiting voters, many of them residents of the northwest, predominantly black Fort Lauderdale neighborhood. And they were already Obama supporters, judging by their shirts.