The daughter of former President John F. Kennedy, Caroline Kennedy has been active in supporting Democratic causes, and considered seeking a Senate seat in 2008.

Joseph Kennedy is the son of former Rep. Joseph Kennedy II (D-Mass.) and grandson of former presidential candidate and Sen. Robert Kennedy (D-N.Y.). He is running to fill retiring Rep. Barney Frank’s (D-Mass.) seat.

“This is a race we do not want to lose, with a truly fine candidate we really want to win,” philanthropist Patricia Duff wrote in the invitation.