Super Tuesday lifted presidential candidate Joe Biden to the front of the Democratic field last week.

On Super Tuesday II, he expanded his lead.

The former vice president is projected to win the primaries in Idaho, Michigan, Mississippi and Missouri, four of the six states that voted on Super Tuesday II. The races in North Dakota and Washington were still up in the air as Wednesday morning approached.

Delegate-rich Michigan was the night's biggest prize. US Sen. Bernie Sanders won in Michigan four years ago and was looking for another win to regain some momentum in the race.

Sanders was leading in delegates going into Super Tuesday, and then Biden won 10 of the 14 states that day.

It's effectively a two-man contest now. US Sen. Elizabeth Warren and former New York Mayor Michael Bloomberg dropped out after lackluster showings on Super Tuesday.

Carla Strickland and her son, Xavier Rogers, get ready to vote at a polling station in Detroit.
Carla Strickland and her son, Xavier Rogers, get ready to vote at a polling station in Detroit.
Junfu Han/Detroit Free Press/Imagn
Election volunteers count absentee ballots in Livonia, Michigan, on Tuesday.
Election volunteers count absentee ballots in Livonia, Michigan, on Tuesday.
Ryan Garza/Detroit Free Press/Imagn/Sipa USA
George Tronicek files his ballot in Maplewood, Missouri.
George Tronicek files his ballot in Maplewood, Missouri.
Laurie Skrivan/AP
Young girls help their mother submit her ballot in Flint, Michigan, on Tuesday.
Young girls help their mother submit her ballot in Flint, Michigan, on Tuesday.
Jake May/AP
Workers processing ballots in Renton, Washington, had scheduled hand-washing breaks because of the coronavirus.
Workers processing ballots in Renton, Washington, had scheduled hand-washing breaks because of the coronavirus.
Ted S. Warren/AP
Workers in Cleveland begin to tear down the setup at Cuyahoga Community College, where Biden was scheduled to hold an election-night rally on Tuesday. Both Biden and US Sen. Bernie Sanders canceled their Tuesday night rallies as a precaution against the coronavirus.
Workers in Cleveland begin to tear down the setup at Cuyahoga Community College, where Biden was scheduled to hold an election-night rally on Tuesday. Both Biden and US Sen. Bernie Sanders canceled their Tuesday night rallies as a precaution against the coronavirus.
Scott Olson/Getty Images
Election workers in Seattle collect ballots from a drop box on Tuesday. In Washington, voting is done by mail. People can also drop off their ballots at designated places.
Election workers in Seattle collect ballots from a drop box on Tuesday. In Washington, voting is done by mail. People can also drop off their ballots at designated places.
John Froschauer/AP
Sanders visits, from left, custodian Davonta Bynes, principal DaRhonda Evans-Stewart and social worker Kim Little outside a polling location at Detroit's Warren E. Bow Elementary School.
Sanders visits, from left, custodian Davonta Bynes, principal DaRhonda Evans-Stewart and social worker Kim Little outside a polling location at Detroit's Warren E. Bow Elementary School.
Paul Sancya/AP
A voter is accompanied by a dog as she casts her ballot in Detroit.
A voter is accompanied by a dog as she casts her ballot in Detroit.
Rebecca Cook/Reuters
Shelves of ballots are seen in Renton, Washington, on Tuesday.
Shelves of ballots are seen in Renton, Washington, on Tuesday.
Jason Redmond/AFP/Getty Images
A voter is seen at a polling place in Detroit on Tuesday.
A voter is seen at a polling place in Detroit on Tuesday.
Erin Kirkland/Bloomberg/Getty Images
People vote in Grosse Pointe, Michigan.
People vote in Grosse Pointe, Michigan.
Jeff Kowalsky/AFP/Getty Images
Biden speaks at a campaign event in Columbus, Ohio, on Tuesday.
Biden speaks at a campaign event in Columbus, Ohio, on Tuesday.
Matthew Hatcher/Bloomberg/Getty Images
Sanders T-shirts are for sale outside the Huntington Center in Cleveland, where Sanders was scheduled to hold a rally.
Sanders T-shirts are for sale outside the Huntington Center in Cleveland, where Sanders was scheduled to hold a rally.
Megan Jelinger/AFP/Getty Images
A Sanders staff member posts a cancellation note on the doors of the Huntington Center in Cleveland.
A Sanders staff member posts a cancellation note on the doors of the Huntington Center in Cleveland.
Megan Jelinger/AFP/Getty Images
Workers use gloves to sort mail-in ballots in Renton, Washington, on Tuesday. Election officials mandated the precautionary measure <a href="index.php?page=&url=https%3A%2F%2Fwww.cnn.com%2F2020%2F03%2F09%2Fpolitics%2Fprimary-election-voter-turnout-coronavirus%2Findex.html" target="_blank">because of the coronavirus outbreak.</a>
Workers use gloves to sort mail-in ballots in Renton, Washington, on Tuesday. Election officials mandated the precautionary measure because of the coronavirus outbreak.
Jason Redmond/AFP/Getty Images
Biden has <a href="index.php?page=&url=https%3A%2F%2Fwww.cnn.com%2F2020%2F03%2F10%2Fpolitics%2Fjoe-biden-testy-gun-exchange-michigan-worker%2Findex.html" target="_blank">a testy exchange about gun rights</a> as he tours a Fiat Chrysler assembly plant in Detroit on Tuesday. A man confronted Biden and accused the candidate of trying to "take away our guns." Biden responded, "You're full of s***" and tried to clarify his policies, saying he supports the Second Amendment.
Biden has a testy exchange about gun rights as he tours a Fiat Chrysler assembly plant in Detroit on Tuesday. A man confronted Biden and accused the candidate of trying to "take away our guns." Biden responded, "You're full of s***" and tried to clarify his policies, saying he supports the Second Amendment.
Mandel Ngan/AFP/Getty Images
People cheer for Biden before he spoke in Touglaoo, Mississippi, on Sunday.
People cheer for Biden before he spoke in Touglaoo, Mississippi, on Sunday.
Rogelio V. Solis/AP
Sanders addresses supporters during a campaign rally in Grand Rapids, Michigan, on Sunday. Sanders won Michigan's primary four years ago.
Sanders addresses supporters during a campaign rally in Grand Rapids, Michigan, on Sunday. Sanders won Michigan's primary four years ago.
Jeff Kowalsky/AFP/Getty Images
Sanders supporters raise signs during his rally in Grand Rapids on Sunday.
Sanders supporters raise signs during his rally in Grand Rapids on Sunday.
Salwan Georges/The Washington Post/Getty Images
Sanders speaks to supporters in Ann Arbor, Michigan, on Sunday.
Sanders speaks to supporters in Ann Arbor, Michigan, on Sunday.
Brittany Greeson/Getty Images
A voter takes a photo of himself dropping off his ballot in Renton, Washington, on Monday.
A voter takes a photo of himself dropping off his ballot in Renton, Washington, on Monday.
John Moore/Getty Images
Biden is greeted by US Sen. Cory Booker at a campaign event in Flint, Michigan, on Monday. Booker, a former presidential candidate, <a href="index.php?page=&url=http%3A%2F%2Fwww.cnn.com%2F2020%2F03%2F09%2Fpolitics%2Fcory-booker-endorses-joe-biden%2Findex.html" target="_blank">endorsed Biden</a> during the event. Biden has also scored endorsements from several other former candidates, including US Sen. Amy Klobuchar, US Sen. Kamala Harris, former New York Mayor Michael Bloomberg and former South Bend, Indiana, Mayor Pete Buttigieg.
Biden is greeted by US Sen. Cory Booker at a campaign event in Flint, Michigan, on Monday. Booker, a former presidential candidate, endorsed Biden during the event. Biden has also scored endorsements from several other former candidates, including US Sen. Amy Klobuchar, US Sen. Kamala Harris, former New York Mayor Michael Bloomberg and former South Bend, Indiana, Mayor Pete Buttigieg.
Mandel Ngan/AFP/Getty Images