New @NBCNews exit polls: Medicare for All goes four-for-four with Democrats in early states.

IOWA — 57% support, 38% oppose
N.H. — 58% support, 37% oppose
NEVADA — 62% support, 35% oppose
S.C. — 50% support, 44% oppose

— Sahil Kapur (@sahilkapur) February 29, 2020