Since Super Tuesday, some things have changed. Former Democratic nomination hopefuls Sens. Kamala Harris and Corey Booker endorsed Joe Biden over the weekend. The Rev. Jesse Jackson endorsed Sanders, a coda back to the 1988 democratic primary, in which Sanders endorsed Jackson, who was at the time, largely seen as a spoiler against Mike Dukakis. With Biden picking up more mainstream Democratic endorsements, the pressure is on the Sanders campaign to show strong numbers in Tuesday's contests, particularly in Michigan and Washington state, which he won in 2016, but appears to be falling behind in the polls this time around. 

Elena Schneider, national political reporter at Politico, where she covers the 2020 Democratic presidential primary and general election, previews this week’s primaries and caucuses and discusses the latest developments in the campaigns.