Presumptive GOP presidential nominee Mitt Romney apologized Thursday for an incident in which he allegedly bullied a boy who was believed to be gay.

"I did some dumb things and if anybody was hurt by that or offended ... obviously I apologize," Romney said on Kilmeade & Friends, a radio show.

Romney said he doesn't remember an incident from 1965 described in The Washington Post. The story quotes five of Romney's classmates from Cranbook School in a Detroit suburb as saying he led a group of boys who pinned down John Lauber while Romney himself cut the boy''s "bleached blonde hair that draped over one eye."

Lauber was described in the article as being "teased for his nonconformity and presumed homosexuality."

The Post story comes a day after President Obama said same-sex marriage should be legal, and the topic of gay marriage has taken center stage in the presidential campaign. The Democratic National Committee's rapid response team circulated the story in an e-mail.

Romney told radio host Brian Kilmeade that he wasn't "going to be too concerned" about the article.

"I don't remember that incident and I'll tell you I certainly don't believe that I ... thought the fellow was homosexual," Romney said. "That was the furthest thing from my mind back in the 1960s, so that was not the case."