“Christine Quinn . . . is the only likely mayoral candidate with her own dedicated band of protesters. . . Since 2009, a small cadre of demonstrators has targeted Ms. Quinn at dozens of appearances, a rare public show of unwavering anger toward one New York City politician. Their complaints vary, but as a group, they stick to one overall message—that Ms. Quinn shouldn’t be mayor . . .  Although they operate on the fringe, the protesters represent somewhat more than a nuisance for Ms. Quinn: The issues they raise are among those that Ms. Quinn is likely to have to address from more mainstream critics as she gears up for a City Hall run.”