(Columbus) — President Obama has urged graduating Ohio State University students to be active citizens, to fight for causes they believe in, and to be better than generations before them.

Obama spoke to thousands of graduates and audience members who had stood in long lines wrapping around Ohio Stadium on a breezy, 70-degree Sunday.

They passed through metal detectors and bag checks amid security heightened because of the president's visit and increased caution after the Boston Marathon explosions.

Local police, state troopers and secret service agents were among the security forces on hand.

Audience member Collin Shaum of Mansfield said he felt "safe-ish" with the visible security.

The university said he would be the third sitting president to deliver its commencement address. The others were presidents George W. Bush in 2002 and Gerald Ford in 1974.

His other commencement speeches this season are scheduled later at all-male Morehouse College in Atlanta and the U.S. Naval Academy in Annapolis, MD.

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(Copyright © 2013 by the Associated Press, all rights reserved. Photos by Matt Sullivan/Getty Images.)