Who played C.J. Cregg in 'The West Wing'?

Who played Carmela Soprano in 'The Sopranos'? Who played Christopher Moltisanti in 'The Sopranos'? In which TV series is Christopher Moltisanti a main character? In which TV series is Josiah Bartlet a main character? In which TV series is C.J. Cregg a main character? Who played Josh Lyman in 'The West Wing'? In which TV series is Hal a main character? Who played Malcolm in 'Malcolm in the Middle'?