One of John McCain's campaign co-chairs is calling Barack Obama "a guy of the street" -- while raising the issue of Obama's teenage drug use.

Former Oklahoma Gov. Frank Keating made the remarks on comedian Dennis Miller's radio show yesterday while talking about Obama's record. He calls that record "very extreme" and says Obama ought to be more forthcoming about his past. Keating says Obama should admit he was "way to the left," ''used cocaine" and "voted liberally," before moving to the political center.

In his memoir "Dreams From My Father," Obama describes experimenting with marijuana, cocaine and alcohol as a teenager, saying he'd been headed toward becoming a "junkie" before straightening himself out.

McCain aides say Keating had not been asked to bring up Obama's past drug use and hadn't cleared his comments with the campaign.