he's shamelessly for sale.
I don't know where this puts him on the blow-hard rankings though... while Rush Limbaugh is clearly king, running away with the title, Sharpton is up there. Maybe you can slot him in company with Glenn Beck (who pushes those sleazy gold investments), and some of the other hacks on Fox News.
as far as the worst blowhard on the left, you have to give the edge to Sharpton now, though Ed Schultz is gaining with his hypocritical stance on unionism, posing with the unions in Wisconsin, yet silently opposing the efforts of MSNBC employees to unionize.