With Democrats and Republicans evenly split in the U.S. Senate, the stakes are high for senate races in key toss-up states. 

Former President Trump is vocally supporting the candidates he favors. However, one big name is not leaning into these races as much; President Biden. Why? It likely comes down to Biden's popularity. 

For example, he is not popular in North Carolina, so that could play a role in why he has never campaigned with the Democratic candidate in the state.

With just over two weeks from election day, polls are neck and neck in key senate races in states like Nevada, Georgia, Pennsylvania and North Carolina.

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Cheri Beasley and Ted Budd photos in split next to each other

North Carolina Senate candidates Cheri Beasley, a Democrat, and Ted Budd, a Republican. (Allison Lee Isley for The Washington Post, Bill Clark/CQ-Roll Call, Inc via Getty Images)

"It’s been back and forth with them ahead, us ahead, them ahead," President Biden said at a news conference on Friday.

Biden is keeping a close eye on those races, but is not directly involving himself in most of them.

"The president is welcome to North Carolina," said Cheri Beasley, the Democrat running for Senate in North Carolina. "It’s great if he comes to see the successes and also our challenges."

However, a presidential visit might not be in Beasley’s best interest. Biden lost North Carolina to former President Trump in 2020. 

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"Cheri Beasley always finds a way to be very busy any time Joe Biden's administration comes to North Carolina," said Beasley’s opponent, Trump-backed Rep. Ted Budd. 

Budd said Beasley does not want to be publicly tied to Biden's policies. However, UNC Charlotte political science professor Eric Heberlig said it is probably more about optics.

"For Biden to visit here and for there to be photos of Beasley and Biden together, that would easily show up in Budd's television commercials, and that’s what Beasley’s trying to prevent," Heberlig said.

President Biden talks with Gisele Barreto Fetterman while Pennsylvania Senate candidate John Fetterman stands nearby

President Biden talks with Pennsylvania Lt. Gov. John Fetterman, a Democratic candidate for U.S. Senate in Coraopolis, Pennsylvania.  (AP Photo/Patrick Semansky)

President Biden said he has campaigned with 15 candidates for the midterms. He has visited candidates in mostly reliably blue states like California, Oregon and Colorado. Then, there is Pennsylvania. Pennsylvania is not reliably blue, but Biden was born there.

"So that local boy connection is enough to offset any critique people have about Biden's performance as president," Heberlig said.

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Biden’s visit to Pennsylvania was mostly behind closed doors. He went to a private fundraiser for Senate candidate John Fetterman.

Biden shaking John Fetterman's hand

President Biden speaks with Pennsylvania Lt. Gov. John Fetterman, a Democratic candidate for U.S. Senate, after stepping off Air Force One, Thursday, Oct. 20, 2022. (AP Photo/Patrick Semansky)

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Biden is visiting Florida next week to hold a rally and fundraise with Democrats including gubernatorial candidate Charlie Crist. Heberlig said the visit is low risk because Democrats are not expected to win there anyway.

"Even if the visit isn't likely to help Crist beat Gov. Ron DeSantis, Florida is likely to remain on somewhat competitive list in 2024, so Biden has incentive to give it some personal attention," Heberlig said.