Not particularly relevant to this thread, but I’ve been wanting to point out somewhere that for the Republicans to block appointment at this hour seems really stupid. It looks unlikely that Sanders will win against Hillary, and the Republican’s only candidate who is doing somewhat well against Trump is Rubio. And if Rubio can’t trump Trump, he’s certainly not going to win the big office.
So we’re looking at either Hillary - a Democrat - or Trump - an insane faux-Republican centrist - putting in the next Justice.
If Hillary is elected, then you’re basically right back in the same place, except she will have more clout as a president in her first term, rather than as someone who’s quickly reaching his expiration date and doesn’t have anything to bargain with. She’ll be able to nominate someone fairly hardcore lefty and push that person through to the office. You’ll end up with someone fairly left of center.
If Trump is elected, then the people will probably vote more Democrats into the Legislative branch, to balance the Federal government against a “Republican” president. So now you have a crazy, non-legal, pro-choice centrist nominating someone to be approved by a Democratic Legislature. You’ll end up with a Justice who’s probably a little left of center.
Right now, the Republicans have the strongest ability that they’ll have to push for a reasonable, centrist candidate. Holding off, they’re going to end up with someone leftist, and/or insane.