The next president will get a Supreme Court appointment. There is no way that the Senate, as presently constituted, will allow Barack Obama to replace Justice Scalia.
Addendum: You can stay abreast of events at Bench Memos.
Addendum 2: If Obama wants to replace Scalia, he will have to nominate someone who is acceptable to many Republicans. Someone like this.
Addendum 3: Federal judge Richard A. Posner wasn't a fan of Scalia's.
