Schumer stopped briefing due to frustration over GOP efforts to confirm a new Supreme Court justice
Watchdog claims Maine Dem illegally coordinated with Schumer super PAC
Schumer has made capital statehood for heavily Democratic city a 'top priority'
Greenfield has taken more than $230,000 from leadership PACs bankrolled by corporations, lobbyists
McGrath outspent insurgent Dem lawmaker 40:1
Dem called Senate run 'an absolute no' until Schumer, Obama intervened