Fears are growing among members of the Democratic Party due to how fast the current Senate race in the state of Wisconsin has become close, causing many to worry that they could end up losing the important contest, news outlet Axios reported. The lead that was previously enjoyed by incumbent Sen. Tammy Baldwin, a Democrat, in both public and internal party polls has slipped through her fingers. Meanwhile Republicans are pouring money into the state to help the GOP pull off a major upset in a critical race to determine who will control Congress after November’s election.

According to the article, Baldwin is only ahead in internal Democratic polling by two points, a source who is close to the campaign said. And that is significantly closer than what has been seen in the public polling over the last several months. Republicans are now on pace to outspend the Democrats every week from this point until Election Day, thanks to a $20 million infusion of cash from GOP sources.

One of the reasons fears have gone up among Democrats over this race is because if Baldwin loses her seat to GOP candidate Eric Hovde, it could mean they will lose any chance of holding on to the majority they have in the Senate. Wisconsin was formerly a pretty safe bet for Democrats, much like Nevada and Arizona, but that has begun to change.

“A national Democratic strategist working on Senate campaigns pointed specifically to a recent poll from Marquette University, which showed Baldwin with a six-point lead. The race, the strategist said, is much closer than that. Over the next month, Republicans in the state have a nearly $3.5 million spending advantage on the airwaves, according to a source familiar with ad buys in Wisconsin. A super PAC linked with Senate Minority Leader Mitch McConnell (R-Ky.) is making a new $17 million investment in the state, along with Hovde making his own infusion of over $2 million,” Axios said. “But Democrats have already spent over $100 million in the state this year, giving them an overall spending advantage since January of almost $30 million, according to AdImpact.”