Super Tuesday is the biggest day of the primary calendar. Fourteen states vote in primaries from the Atlantic to the Pacific, including the two most populous states, California and Texas.

There are some key questions ahead of Tuesday’s vote. Can Vermont Sen. Bernie Sanders put it away? Super Tuesday represents his biggest chance to prove his case.

Does former Vice President Joe Biden emerge as the clear alternative, now that former South Bend, Indiana, Mayor Pete Buttigieg and Sen. Amy Klobuchar have dropped out?

And does former New York Mayor Mike Bloomberg’s billions in ad spending move votes? It will be his first time on the ballot in the 2020 race.