But the idea that the "American People" wouldn't have a say with an Obama appointment is absurd. He was elected with a clear majority and Presidents are elected for four years, not four years minus whenever the next presidential race gets going.
I know you've expressed elsewhere (edit: in this thread) that Republicans have already made it clear that they won't do an appointment this presidency (and you're probably right that they're trying to set themselves firm in this as quickly as possible), but I can't imagine a scenario where Obama doesn't put forth a nomination post-haste. I also cannot imagine 11 months of blocking a SCOTUS nomination and leaving the court with 8 members.
This isn't the first time this has happened. The Supreme Court will function just fine with 8 justices.
Blame John Adams!
But that's exactly what the Democrat-controlled Senate did after Justice Abe Fortas resigned in disgrace in 1969. They knocked down Nixon's first two nominees, and Fortas wasn't ultimately replaced by Blackmun until a year later[0][1][2].
[0] - Several Wikipedia pages say May 12, but:
[1] - this one says May 17: https://en.wikipedia.org/wiki/Unsuccessful_nominations_to_th...
[2] - this page says June 9: http://supremecourthistory.org/timeline_blackmun.html
I like to imagine he and the Democrats in general might actually end up looking better if that's how it plays out.
In any event any parliamentary ruling is appealable to the floor where it is subject to a majority vote. The is the basis of the so-called nuclear option.
McConnell's hand can be forced if there is a majority willing to do what it takes to force it. If he has the procedural support of his caucus (even if they disagree on the ultimate question) he can prevent a vote from coming to the floor.
Edit: I misread the first sentence. Mea culpa.
The right-winged politicians are posturing to make this a presidential election issue, maybe even a big one.
Electing a president who will in turn appoint a SCOTUS Justice may sway more people to vote. Perhaps the the politicians believe that they can use the normal wedge issues (abortion, death penalty, guns, etc.) to have a strong showing on election day.
I would tend to agree that an open SCOTUS seat would motivate more conservatives to vote. But, these things have a way of back firing for politicians and a lot can happen between now and November.