Al Sharpton: Politician. Gadfly. Cyclist? Tonight’s monthly Critical Mass bike ride and rally will have some additional cachet thanks to the outspoken activist, as he joins the cyclists to highlight a “common pattern of NYPD harassment experienced by diverse groups of law-abiding citizens,” according to the press release from the Time’s Up! group. You’ll recall that before the Republican convention came to town in 2004, the NYPD tended to cooperate with the Critical Mass rides......