A Republican group has launch a radio advertisement targeting Gov. Mark Dayton, criticizing the state's health insurance exchange and for a new $77 million office building for state senators and staff.

The local branch of Americans for Prosperity is spending more than $100,000 to air the ad, mainly in Duluth, Mankato and Rochester. They also purchased some air time in Minneapolis and St. Paul.

"Minnesota families are suffering under harmful, big-government policies, and they've had enough," said the group's local director, John Cooney. "Governor Dayton would rather appease his liberal friends and allies in the state legislature in St. Paul than pursue policies that would create more jobs and more prosperity for his constituents throughout Minnesota."

Listeners are directed to sign a petition at daytonsdisaster.com.

Alliance for a Better Minnesota, the lead outside group backing Dayton and other Democrats, immediately launched a fundraising appeal after the ad was launched.

ABM noted that the conservative billionaires Charles and David Koch founded Americans for Prosperity and spent $122 million in the 2012 election cycle.

Carrie Lucking, executive director of ABM, said the rival group is trying to take "Minnesota back to a state that looks out for the wealthy, not hard working Minnesotans."

"We've made too many strides -- from raising the minimum wage to paying back our schools-- and have too much work left to do to let conservative billionaires stop us now," Lucking said.

Listen to the ad here.