Television and radio ads already airing to influence Minnesota voters in races for U.S. House, U.S. Senate and the governor's race and are unlikely to let up until Election Day.

Although the ads are coming late -- during the competitive U.S. Senate race in 2008 the air war was already months old by this point -- their appearance presages a barrage through November.

With potentially heated races for governor and U.S. Senate as Republicans work to wrest both offices from Democrats who won their first races by narrow margins, candidates and their allies will battle across the state's airwaves. National interests see the 8th Congressional District, which has flopped between Democratic and Republican control in recent years, as ripe for a turn over and therefore overdue for more ads.

In the governor's race, Republican Marty Seifert plans to launch his first ad this week, his campaign said on Wednesday. It is the first TV spot in the race that will determine whether DFL Gov. Mark Dayton keeps his job. Andy Post, Seifert's campaign manager, said the ad will run during the Minnesota Wild's Friday night game.

Seifert is in a pitched battle to woo Republicans at the party's endorsing convention this month and the GOP will likely also have a crowded primary in August. Businessman Scott Honour, another contender for Republican votes, has also been running radio ads.

Dayton, who has amassed larger campaign coffers than any of the Republicans running against him, has not yet started television ads. He is focused on the legislative session and unlike in his first election, does not face a primary. His campaign manager Katharine Tinucci said he has the resources to run ads when the time comes but, "that time is not now."

Minnesota viewers may see and hear more ads in the other statewide contest -- the race for the U.S. Senate.

In that race, the most significant candidate media spending has come from Democratic U.S. Sen. Al Franken. This week started a six figure television ad campaign. He has raised more than all but a few sitting senators so likely has the resources to keep it up.

Republican Senate candidate Mike McFadden started running cable ads a few weeks ago and Republican rival Julianne Ortman began radio ads late last month.

That's only a taste. When Franken first ran, he and then-Sen. Norm Coleman, spent millions on dozens of television ads blasting Minnesotans right until their recount began.

Outside groups are also gearing up. A conservative group launched an anti-Franken ad way back in March.

Meanwhile, the U.S. Chamber of Commerce included Republican U.S. House candidate Stewart Mills in its $3 million television ad campaign to jump-start Republican campaigns "and unite the business community around their efforts," Scott Reed, the chamber's senior political strategist, told the New York Times.