Joseph Kennedy III is mulling running for the congressional seat that will be vacated by Barney Frank, senior Democratic sources said Thursday. Kennedy is the grandson of the late Robert Kennedy and the son of Joseph P. Kennedy II, and has been creating buzz in political circles since early last year, when he delivered a stirring commemoration of John F. Kennedy’s “City Upon a Hill” speech. Kennedy is opening an exploratory committee for the seat, which will allow him to raise money immediately. He would be the first Kennedy to return to Massachusetts politics since the death of Sen. Edward Kennedy in 2009.
