Stephen Crowley/The New York Times
President Obama aboard Air Force One Wednesday on his way to the University of Iowa. Mr. Obama has been barnstorming swing states in support of an extension for lower student loan rates.

By Peter Baker and Jennifer Steinhauer

IOWA CITY — As President Obama wrapped up a barnstorming tour of college campuses in swing states on Wednesday, Democrats and Republicans agreed that they wanted to avoid a steep increase in the student loan interest rate this summer. But the chief issue remained unsettled: how to pay the cost of doing so.

In a second day of campaign-style rallies, Mr. Obama pressed his attack on Republicans, depicting them as unsympathetic to college students in need. Republicans countered by accusing the president and his Democratic allies of playing politics with the issue and trying to raise taxes on small businesses to pay for the subsidized rate.

Caught in the middle were seven million college students who will see the interest rate on their federally subsidized loans double to 6.8 percent on July 1 unless Congress and the White House come together on a plan to prevent that, at a cost of $6 billion. For a typical student, the White House said the higher rate could mean as much as $1,000 in additional debt per year at a time of high unemployment among recent graduates.

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