Gov. Mark Dayton signed an agreement Friday that will sharply limit his ability to personally bankroll his re-election campaign.

Dayton agreed not to spend more than $20,000 of his own money in exchange for about $447,000 in public subsidy. The agreement also limits Dayton's campaign to about $3.6 million.

That's a sharp contrast to 2010, when Dayton poured $3.7 million of his own money into the campaign and narrowly beat GOP rival Tom Emmer.

Now an incumbent with a list of accomplishments, the governor said the agreement will allow him to spend less time raising money and more time traveling the state meeting with Minnesotans.

The agreement has no bearing on what outside groups can spend defending Dayton or attacking his rivals.

Dayton, a department store heir, has already embarked on an active fundraising schedule, taking in more than $1.1 million.

Dayton and his running mate, Tina Smith, came to the Secretary of State's office Friday to file the paperwork to make their campaign official.

The governor said the theme of his first campaign was to make Minnesota better.

"I think we've indisputably made Minnesota a better state," said Dayton, noting new education investments, a balanced budget and progressive legislation, such as legalization of same-sex marriage. "That's why I am running, not only to make Minnesota better, but to make it the best."

Dayton and Smith will travel to Duluth this weekend to accept the DFL's endorsement for governor and lieutenant governor.

Ample signs are already emerging that Dayton will have a heated and divisive race.

A GOP group that has criticized Dayton and Democrats for months parked a rented truck in front of the Secretary of State's office displaying a huge banner criticizing the governor for the troubled rollout of MNsure, the state's health insurance exchange.

The group, Minnesota Jobs Coalition, plans to park the truck outside the DFL State Convention in Duluth.