WASHINGTON _ In voting Monday with stalwart progressives like Sens. Bernie Sanders, I-Vt., and Elizabeth Warren, D-Mass., to keep the government shutdown going, Sen. Kirsten Gillibrand solidified her position at the molten core of the Democratic Party’s left wing.With a likely slam-dunk re-election bid later this year and a 2020 presidential run perhaps beckoning, Gillibrand had little to lose in voting “no” on a Senate resolution to end the 69-hour shutdown.