Many liberals want Justice Ruth Bader Ginsburg to retire immediately, despite her status as a liberal lion and the leader of the "left" side of the bench. Conservatives want her to stick around, again, despite her political leanings and even though she's shown no signs of slowing down whatsoever.
Why? Everybody is worried about Ginsburg's potential replacement. If she retires while President Barack Obama is in office, and before this year's midterms, there's a good chance she'll be replaced with a like-minded judge, leaving the 4-4-Kennedy split. Republicans, obviously, would prefer that she hold out, hoping that 2016 brings a conservative to White House (and one to her seat as well).
We've said it before, and so has Justice Ginsburg: As long as she's able, she's not planning to step aside for anyone. But an interesting article in The Daily Beast argues that it's already too late -- a filibuster would block a liberal replacement anyway.