President Barack Obama will shortly get to make his first appointment to the Superme Court bench.
Souter hails from the relatively liberal wing of the Supreme Court, so any new appointment is unlikely to upset the Conservative voting balance.
There has recently been speculation that Justice Ginsberg is also preparing to step down due to poor health.
Either way, this sets up an interesting confirmation battle. The President may be fast heading for a filibuster proof majority in the House, but many of the Senate democrats are noticeably moderate on a number of social issues.