COLUMBUS, Ohio (AP) -- A tweet by a pediatrician running for Congress in Ohio has drawn parallels between President Barack Obama and Adolf Hitler and two Communist leaders. Her campaign says it was a reference to her stance against abortion but she regrets not fully explaining her meaning.

Republican Marisha Agana's (mah-RIH'-shah ah-GAH'-nahz) tweet Sunday suggested "history has a way of repeating itself" and named Obama and Hitler along with Soviet leader Josef Stalin and Communist Chinese leader Mao Zedong (mow dzuh-dohng). It followed an earlier tweet that called on readers to, as Agana put it, "beware of people who rose meteorically from nowhere like Obama."

Campaign manager Larry Nichols said Tuesday the Warren-area candidate believes any national leader who supports abortion rights is supporting genocide.

Agana is challenging Democratic Rep. Tim Ryan in northeast Ohio's District 13.