Biden had a spectacular showing on Tuesday, winning every single county in Michigan and blowing Sanders out in three other states that voted, essentially sealing the nomination by leaving his lone rival no plausible path forward. But the big takeaway from the day’s big prize, Michigan, isn’t that Biden is a spectacular candidate. The big takeaway is that he doesn’t need to be.

Two things happened on Tuesday in Michigan. First, Democratic turnout exploded. Second, Biden performed far better with key demographic groups than Clinton did four years ago. If either one of those things happen in November, Trump will have a difficult time winning the state again. If both things happen, the president can kiss Michigan’s 16 electoral votes goodbye—and with them, more than likely, the electoral votes of Wisconsin and Pennsylvania.

There goes the White House.

Far-fetched? Hardly. Beating Trump in November does not require an electoral juggernaut. This is because Trump himself, despite his frequent boasts to the contrary, is no electoral juggernaut. The president won the Electoral College in 2016 by a whisker. He carried three states—Michigan, Wisconsin, Pennsylvania—by a combined 77,744 votes. Notably, in those states, Clinton won roughly 600,000 fewer votes than Barack Obama did in 2012. The reason: a failure to mobilize black voters, and dismal performances among both affluent suburbanites and working-class whites.