4/22 update: Land's first TV ad -- which can be seen here -- is titled "Really" and pushes back against the notion that she is "waging a war on women." Land says in the ad, "As a woman, I might know a little bit more about women than Gary Peters."

Republican Terri Lynn Land is set to air the first TV ad of her U.S. Senate campaign in Michigan beginning Tuesday, two Democrats tracking the ad battle told Post Politics.

Land's campaign is spending just over $300,000 to air the ad on cable and broadcast television in the Detroit, Flint, Grand Rapids and Lansing media markets, the Democrats said. They spoke on the condition of anonymity to provide a candid assessment of the air war.

The Detroit News first reported the ad.

Land's campaign has not released the ad yet and a spokeswoman did not immediately respond to a request for comment on the matter, so its not clear what the ad's subject will be. But on her campaign's YouTube page, Land uploaded a new video Monday called "Success Story" that resembles a TV ad. The 30-second video is designed to tout Land's humble roots and private-sector success, mentioning the trailer park and motel her grandparents owned where she worked.

"She grew up in a trailer park and motel owned by her grandparents. Terri Lynn Land worked her way up from cleaning rooms at the motel to managing it. Terri earned a college degree, married and ran the motel," the narrator says.

Democrats plan to make the back story of the trailer park an issue during the campaign. Buzzfeed recently reported that her grandparents sold the trailer park in the mid-1990s to a family business interest which later decided to close it and rezone the land for commercial use, forcing families who lived there to leave.

Land's campaign didn't respond to a request seeking confirmation of whether the video is the spot that will air on TV.

Polls show a close race between Land and Rep. Gary Peters (D) in the race for retiring Democratic Sen. Carl Levin's seat. The Fix rated the race the ninth most likely to flip party control in its most recent rankings.