Sensing an opportunity in swing-state Wisconsin, Republicans are pouring money into the bid to unseat incumbent Democratic Senator Tammy Baldwin in that state’s closely watched Senate race.

Democrats also have dialed up their efforts in the contest, which remains crucial to their hopes of maintaining their Senate majority. They maintain an overall spending advantage and insist that the contest was always going to tighten as Election Day nears.

A loss in Wisconsin to GOP nominee Eric Hovde would make preserving Democrats’ majority extremely difficult in a national landscape in which Republicans have far fewer seats to defend this year.

That prospect has Republicans feeling optimistic about the race. “It’s pretty clearly a jump ball right now,” said Republican strategist Alec Zimmerman, who worked on Senator Ron Johnson’s winning 2022 campaign.

Democrats have outspent Republicans on advertising in the Wisconsin Senate race, $93 million to $69 million, according to AdImpact, which tracks campaign ad spending. Baldwin’s campaign accounts for more than a third of all Democratic spending on ads, while Hovde has been more dependent on outside groups.

But Republicans have invested more heavily than Democrats in advertising down the stretch, with $21 million in spots reserved between October 14 and November 5 compared to $15 million in spots reserved by Democrats.

Almost two-thirds of the new GOP spending comes from the Senate Leadership Fund, the political action committee led by Senate Minority Leader Mitch McConnell, which has reserved $13.1 million in ad spots.

“The momentum’s on my side,” Hovde said at a forum in Milwaukee. “I plan to win this race. I will win this race because I’m going to stay focused on what matters.”

Baldwin, who was campaigning in western Wisconsin with vice presidential nominee Tim Walz, said in a statement that she was not surprised about the state of the race.

“We always knew the race was going to tighten,” Baldwin said. “That’s why I’ve been working every day to bring Wisconsinites together behind my campaign. … I’m confident that we have the strength, momentum, and message to win.”

Democratic strategist Melissa Baldauff said Hovde has shored up his support among the Republican base and has the money to spend to get his message out, including the outside funding. Hovde has loaned the campaign at least $13 million of his own money to be spent on the race.

To win, Baldwin just needs to be herself and tout her record, Baldauff said.

“That’s one of her strengths and one of the things that sets this race apart from other Senate races across the country,” Baldauff said. “The fact that people know who she is, she does what she says she’s going to do and she shows up across Wisconsin.”

Zimmerman, the Republican strategist, said Baldwin faces the toughest political environment of any of her three races. Hovde has the advantage of Trump’s campaign of lies on issues like the economy and immigration.

“Wisconsin has always been on a knife’s edge,” Zimmerman said. “Fifty-fifty elections are the rule here, and she’s always been the exception. What you’re seeing here is a return to that principle.”

Four of the past six presidential elections were decided in Wisconsin by less than a percentage point. Its races for U.S. Senate have not been quite as tight — Baldwin won by nearly 6 points in her first race in 2012 and by almost 11 points in 2018. But in 2022, Johnson won a third term by only a point.

The Baldwin race is critical for Democrats who are defending 23 seats in the Senate, including three held by independents who caucus with Democrats clinging to a 51-49 majority. That’s compared with just 11 seats that Republicans hope to keep in their column.

Baldwin has said she was employing the same strategy as her past campaigns, traveling to both red and blue parts of the state touting her record fighting for Wisconsin farmers and the middle class. She has visited every major media market in the state.

To bolster her bipartisan bona fides, Baldwin earned the endorsement from the conservative Wisconsin Farm Bureau for her work benefitting the state’s agriculture and dairy industries, making her the first Democratic candidate in a statewide race to win it in more than 20 years.

Baldwin has attacked Hovde as an out-of-touch carpetbagging millionaire intent on cutting Social Security and Medicare, ending the Affordable Care Act and supporting a national abortion ban. Ads have focused on Hovde’s role as CEO of H Bancorp and its primary subsidiary, Utah-based Sunwest Bank, and the fact that he owns a $7 million estate in Laguna Beach, California.

Hovde was born in Madison, owns a house there, and claims he has never been a full-time resident of California.

She has also hit him on past statements he has made voicing opposition to abortion rights and his support for returning the federal budget to 2019 levels, which Democrats says will results in massive cuts to popular programs like Social Security, Medicare, Medicaid and veterans benefits.

If Hovde wins, Wisconsin will be represented by two Republicans in the Senate for the first time since 1957. But Republicans would have to overcome Democratic momentum that has resulted in their candidates winning 14 of the past 17 statewide elections.

Scott Bauer and MI Staff

Associated Press

MADISON, Wisconsin

Kayla Wolf (AP), Mark Hoffman (AP), and Alex Brandon (AP)