Delaware Senator Tom Carper had his career challenged on Thursday by primary opponent Kerri Evelyn Harris. Carper, 71, is running for his fourth term in office, with a reputation of swiftly defeating those who run against him. This year, however, was different.

This is Harris’ first time running for office. Harris, 38, is an Air Force veteran, a community activist, a member of the LGBT community and a woman of color. Despite being clearly underfunded, with a budget of roughly $140,000, Harris caused quite the stir in the elections.

But Carper did not disappoint and took the lead again with 64.6% of the votes, as opposed to Harris’ 35.4%. On the Republican side, Robert Arlett took the lead with 66.8% of the vote, beating Eugene Truono and Rocky De La Fuente in the Republican primaries.

Throughout the elections, candidate Harris counted on Alexandria Ocasio Cortex’s support, known candidate from New York’s 14th Congressional District, who hosted townhalls in Delaware jointly with Harris.

“She had my back and I’m here to have hers,” said Ocasio-Cortez in Newark, “because that’s how the progressive movement really works.”

Despite Harris’ popularity, the leftist Democratic candidate acknowledged that winning the elections would be difficult with Senator Tom Carper as an opponent. Carper had been governor for eight years before he ran for the Senate in 2001. The Senator began his career in 1977, when he ran for statewide office as treasurer. If Harris won the elections, it would have been Carper’s first loss out of the decades he served in office.

Carper is looking at his fourth year as Senator, currently serving his third term. In an interview with the Washington Post, however, Carper confirmed that his next term would be his last in office.

The Democratic Senator is a well-known moderate Democrat. Carper is publicly against the Medicare-for-all legislation and also voted to roll back the landmark 2008 Dodd-Frank Act, which exempted small banks from certain regulations.

Throughout his campaign, Carper expressed support for the $15 minimum wage. He is also being backed up by various environmental groups such as the League of Conservation Voters and other gun control groups including Giffords.

The state’s two major labor unions are also huge fans of the democratic candidate. Both the Delaware AFL-CIO and the Delaware State Education Association raised $3 million in cash for Carper’s campaign.

Democratic Senator Tom Carper’s win on Thursday marks three decades in a row in which the Senator has yet to lose a race. The Senator once again managed to defend his seat against Kerri Evelyn Harris, his leftist Democratic opponent.