In retrospect, a few things made Sanders's Feb. lead look more imposing than it really was:

1) IA/NV were caucuses (a rarity and a Biden weakness)
2) Sanders only got 34% initial preference in NV, but he was often cited at 47%
3) A huge share of Dem voters were still in flux

— Dave Wasserman (@Redistrict) March 3, 2020