Keep going back to my original potential scenario: Warren takes Iowa, Sanders New Hampshire and Biden South Carolina and Nevada?
Sanders leads, Biden slumps in N.H. poll 
DURHAM, N.H. — Former Vice President Joe Biden suffered a precipitous drop in the latest New Hampshire poll, falling to the lowest point his campaign has seen this election, while Sen. Bernie Sanders recaptured his first-place spot narrowly over Sen. Elizabeth Warren.
Sanders was the first choice of 21 percent of likely Democratic primary voters, followed by Sen. Elizabeth Warren at 18 percent, Biden at 15 percent and South Bend (Ind.) Mayor Pete Buttigieg at 10 percent, according to the Granite State Poll conducted by the University of New Hampshire and co-sponsored by CNN.
In a three-way tie for fifth place: entrepreneur Andrew Yang, Sen. Amy Klobuchar of Minnesota and Rep. Tulsi Gabbard of Hawaii, each at 5 percent.
https://www.google.com/amp/s/www.politico.com/amp/news/2019/10/29/bernie-sanders-joe-biden-new-hampshire-poll-061068