Kamala Harris has her running mate, naming Minnesota Governor Tim Walz her vice presidential candidate. Harris announced Walz’s selection Tuesday.

Predictions market Polymarket gave Walz just a 16% chance of earning the vice presidential nod last week, but he quickly gained widespread support from Democrats and Harris. Walz earned the spot over Pennsylvania Governor Josh Shapiro and Arizona politician (and former astronaut) Mark Kelly.

Walz, a veteran and retired teacher, has worked as Minnesota’s Governor since 2019.

“I am proud to announce that I’ve asked Tim Walz to be my running mate,” Harris posted on X. “As a governor, a coach, a teacher, and a veteran, he’s delivered for working families like his. It’s great to have him on the team.”

Harris had a 5.3% chance of winning the 2024 U.S. presidential election on July 1, according to Sports Handle’s election odds tracker. She has since made a dramatic surge after replacing Joe Biden atop the Democratic ticket.

Donald Trump, however, remains the betting favorite to win the 2024 U.S. presidential election.

He’s -133 to win the election on BetMGM UK, with Harris holding +100 odds. U.S. sports betting apps don’t accept political wagers.

On Polymarket, Trump is given a 53% chance to win the election, with Harris at 46%. She was at 37% on the platform as of last week. She’s steadily gained on Trump since taking over for Biden in the race.

Polymarket’s future offering U.S. political election markets could be in jeopardy, as a group of politicians are asking the Commodity Futures Trading Commission to prohibit gambling on American elections.