Who played Malcolm in 'Malcolm in the Middle'?

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'? In which TV series is Hal a main character? 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? Who played Rory Gilmore in 'Gilmore Girls'?