On Tuesday, as expected, Sen. Bernie Sanders won the New Hampshire primary, cementing his position as the Democratic front-runner for president. With 97 percent of the expected vote counted,1 Sanders had 26 percent of the vote, while former South Bend, Indiana, Mayor Pete Buttigieg had 24 percent. The big surprise of the night was Sen. Amy Klobuchar, who finished third with 20 percent. After those three, there was a big drop-off: Sen. Elizabeth Warren finished fourth with 9 percent, and former Vice President Joe Biden ended up fifth with 8 percent.

So how did Sanders win? According to the exit polls, he racked up big margins among demographic groups that make up a good chunk, but still a minority of, the Democratic electorate. Crucially, though, he was still able to win because the rest of the electorate was split among his rivals. For example, “very liberal” voters made up just 21 percent of the New Hampshire Democratic electorate on Tuesday, and Sanders easily beat out Warren to win that group. He tied Buttigieg for the lead among the much larger “somewhat liberal” group, and Buttigieg and Klobuchar split the “moderate” vote.