Here they are in original form, from the Voteview Blog. As you can see above, Republican presidents have gotten more conservative, and since the Carter era, so have Democrats. In Congress, Republicans have shifted markedly to the right, while Democrats, on the whole have not changed much. That graph is after the jump.
Producer Mike Yarvitz notes that Voteview is the work of a pair of great political scientists at the University of Georgia, Keith T. Poole and Christopher Hare. Yarvitz says it's one of his regular reads. Bonus, also after the jump: The charts in video form.