At the taping late Monday afternoon of CBS's Late Show, host David Letterman asked guest Katie Couric about “this bonehead Rush Limbaugh,” prompting Couric to plead: “Dave, don't do this to me, please! Don't do this to me.” But Letterman was just getting rolling with insults as he asserted Limbaugh's attire on Saturday at CPAC made him look “like an Eastern European gangster.” Focusing on Limbaugh's physical appearance, Letterman recited how Limbaugh's “got the black jacket on, the black silk shirt and it's unbuttoned, like, 'oh yeah, you think Rush Limbaugh, you think ooh let's see a little flesh.'”...