MILWAUKEE (AP) - Barack Obama said Friday that the country must do "whatever it takes" to eradicate gun violence following a campus shooting in his home state, but he believes in an individual's right to bear arms.

Obama said he spoke to Northern Illinois University's president Friday morning by phone and offered whatever help his Senate office could provide in the investigation and improving campus security. The Democratic presidential candidate spoke about the Illinois shooting to reporters while campaigning in neighboring Wisconsin.

The senator, a former constitutional law instructor, said some scholars argue the Second Amendment to the Constitution guarantees gun ownerships only to militias, but he believes it grants individual gun rights.

"I think there is an individual right to bear arms, but it's subject to commonsense regulation" like background checks, he said during a news conference.

He said he would support federal legislation based on a California law that would facilitate immediate tracing of bullets used in a crime. He said even though the California law was passed over the strong objection of the National Rifle Association, he thinks it's the type of law that gun owners and crime victims can get behind.

Five people, including the shooter, were killed during Thursday's ambush inside a lecture hall. Authorities said the two guns used were purchased legally less then a week ago.

"Today we offer them our thoughts and prayers, but we also have to offer them our determination to do whatever it takes to eradicate this violence from our streets, from our schools, from our neighborhoods and our cities," Obama said. "That is our duty as Americans."

Although Obama supports gun control, while campaigning in gun-friendly Idaho earlier this month, he said he does not intend to take away people's guns.

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