The first is at San Francisco State University, where the school investigated student who stomped on a Hezbollah flag at an anti-terrorism rally last October.

CENTERFORSECURITYPOLICY: The Islamist attack on free speech

Violence broke out when one Klan sympathiser, trying to distribute white-supremacist literature, got on to the protesters' side of the barricade and ran into an anti-Klan group burning a Confederate flag.

ECONOMIST: Blacks and whites

Last week, hundreds of thousands of protesters took to the streets of Aden, the port city that was once the capital of South Yemen, chanting anti-unification slogans and waving the secessionist flag.

WSJ: Yemen Confronts Rising Pressure to Divide

The reporter also noted that the Illinois senator does not wear an American flag lapel pin, has met with former members of the radical anti-Vietnam War group, Weather Underground, and his wife was quoted recently as saying she never felt really proud of the United States until recently.

CNN: Obama fights back on questions about his patriotism