Democratic frontrunners former Vice President Joe Biden and Vermont Sen. Bernie Sanders are set to compete in six states on March 10, after Biden pulled off an astonishing comeback on Super Tuesday. Primaries will take place in Idaho, Michigan, Mississippi, MIssouri, Washington and North Dakota on Tuesday.

Michigan will be the biggest prize of the night, with 125 delegates. The Washington primary comes in second, at 89 delegates.

J. Miles Coleman, associate editor of the Sabato’s Crystal Ball newsletter at the University of Virginia Center for Politics, told Michigan-based that the Great Lakes State is a “must win” for the Sanders campaign. Coleman believes that Sanders might have trouble winning over college-educated Democrats and suburban women — two groups that are likely to vote for Biden.

“In 2016, that was a group that Sanders had some strength with,” Coleman added. “Sanders is still doing well in college areas, looking to next week I expect him to do well in places like Ann Arbor, but some of Sanders’ coalition that he had in suburban and rural parts of the state might be in trouble.”

A poll released by Detroit News/WDIV-TV on Tuesday showed 29% of likely Michigan primary voters would back Biden, in comparison to 22.5% for Sanders.

Biden had a strong performance on Super Tuesday, winning 10 states including delegate-rich Texas. Sanders was also still competitive, winning California, along with Vermont, Utah and Colorado. Biden currently has 566 delegates, while Sanders has 501.

Bloomberg’s poor performance in the races caused him to suspend his campaign and endorse Biden.

Massachusetts Sen. Elizabeth Warren also had a lackluster showing, earning third place in her home state. There are reports that the Warren campaign is assessing whether she still has a path to the nomination.