Democrat Abdul El-Sayed declared himself senator-elect Tuesday night while speaking to supporters as he held a substantial lead over Republican Mike Rogers in Michigan’s U.S. Senate race.

As of publication, El-Sayed had 1,995,543 votes, or 51.8%, compared with Rogers’ 1,779,101 votes, or 46.2%.

About 77.6% of the estimated vote had been counted, with roughly 1.1 million votes remaining. According to NBC News, Rogers would need to win about 58.7% of the remaining vote to overtake El-Sayed. Neither The Associated Press nor NBC News has called the Michigan race at the time of publication.

The physician and former public health official is running to succeed retiring Democratic Sen. Gary Peters. Rogers is a former congressman and FBI agent.

El-Sayed campaigned on an economic populist platform that included Medicare for All, campaign finance reform, and opposition to U.S. military aid to Israel. Rogers emphasized tax cuts, manufacturing, and his alignment with President Donald Trump.

The contest drew more than $100 million in advertising and became one of the most closely watched Senate races of the midterm election.

El-Sayed reached the general election after defeating U.S. Rep. Haley Stevens in the Democratic primary in August. Stevens later endorsed Rogers.

No Republican has won a Michigan U.S. Senate election since 1994.

Update at 11:27 p.m.

The Associated Press called the race for El-Sayed.