On January 16, 2009, Dayton announced his candidacy for Governor of Minnesota. In a crowded Democratic field of challengers, Dayton chose to bypass the state caucuses and convention in favor of the primary election. He stated he made that decision because the primary election is a more democratic method of choosing a candidate. He relied on personal funds for his campaign. On May 24, 2010, he announced State Senator Yvonne Prettner Solon of Duluth as his running mate for lieutenant governor. On August 10, 2010, Dayton defeated the DFL-endorsed Margaret Anderson Kelliher in a close primary election, 41.33% to 39.75%; Dayton was later endorsed by the Minnesota DFL to earn his party's nomination for governor.