Joe Biden won Michigan’s Democratic primary on Tuesday, extending his lead over main rival Senator Bernie Sanders. Michigan is a key general election battleground, and one which Sanders narrowly won in 2016 against Hillary Clinton.

In 2020, the state emerged as a battleground for black and white blue-collar voters as well as suburban moderates. The Democratic contest has effectively become a two-horse race between Biden and Sanders The former vice president’s victory in Michigan, as well as Missouri and Mississippi, dealt a serious blow to Sanders, who is urgently seeking to jump-start his flagging campaign.