President Obama traveled to Minnesota on Thursday to host an early afternoon town hall event, followed by a fundraiser for the Democratic Congressional Campaign Committee -- the 21st Democratic fundraiser he's attended this year, a review of his schedule shows.

Since Feb. 28, Obama has visited 10 states on 15 different trips that included big-ticket political events that have raised millions of dollars for Democrats — from San Diego to Miami, Houston to Chicago, according to a review of his presidential schedule.

One night on the town in New York City saw Obama attend an event for the Senate Majority PAC, the Democratic National Committee LGBT Gala and a DNC roundtable.

Earlier in the year, Obama traveled to the West Coast for presidential business, but lingered for a few days to travel down the coast for various events, from San Jose to Los Angeles to San Diego. His schedule included a DNC reception and a DCCC/Democratic Senatorial Campaign Committee joint fundraiser.

A few events close to Washington alleviated the need for Marine One or Air Force One to be gassed up, but more than 80 percent of Obama's political events so far in this midterm election year required air travel. According to a report from February, it costs $228,288 per hour to fly the president on Air Force One, a 27-percent increase over the administration of George W. Bush.