In which TV series is Hal a main character?

In which TV series is Josiah Bartlet a main character? Who played C.J. Cregg in 'The West Wing'? In which TV series is C.J. Cregg a main character? Who played Josh Lyman in 'The West Wing'? Who played Malcolm in 'Malcolm in the Middle'? Who played Lois in 'Malcolm in the Middle'? Who played Lorelai Gilmore in 'Gilmore Girls'? In which TV series is Lorelai Gilmore a main character?