Warren builds to the leading candidate polling roughly 35% nationally going into Iowa and subsequently wins the next three states. Biden, still in second place, uses his overwhelming lead to win South Carolina. After Super Tuesday, every candidate save Warren, Biden, and Sanders either drops out or is reduced to single digits. Over the next month each of the other candidates continues to lose support if still in the race until only Warren and Biden are left (Sanders drops after a razor thin Warren loss in Arizona). Warren gets roughly Sanders's support +6 in any of the later states, bar polling or other complicating factors.