Stevenson identifies himself as an "Eisenhower Republican," saying the GOP was more moderate and the tax rates more progressive in the 1950s.
He said economic inequality is one of the main issues that drew him to the Wall Street protest.
"The middle class in America is disappearing," he said.
His past protest experience includes participation in a march for women in Washington, D.C., in 2004.
A social-media fueled plan to #OccupyWallStreet brought hundreds of protesters to Manhattan's financial center starting Saturday, Sept. 17.
|Inside a high-tech San Francisco swinger's party|
|I have a fiancé, a girlfriend and two boyfriends|
|Are smart drugs driving Silicon Valley?|
|Winklevoss twins: Bitcoin will explode beyond $1 trillion|
|Microsoft sales soar for all its non-Windows products|