Paul Giamatti, brilliant sad sack. PBS reports that Paul Giamatti will join the cast of Downton Abbey for Season 4, in the role of Lady Cora’s “maverick playboy” brother. Giamatti has brought sad-sack pathos to such films as American Splendor (as schlubby Harvey Pekar), Sideways (as schlubby wine guy), John Adams (as America’s badass […]