should Ginsburg (and maybe Breyer) retire

[Kaine for Senate '18]

Of course not; no nominee appointed now will get out of the Senate until January 21, 2013.  The Republicans would see to that.

[Kaine for Senate '18]

Obama could probably get a nominee through now if and only if it the need to appoint someone was clearly not due to someone resigning specifically so Obama could appoint the replacement.

Ginsburg could plausibly resign, given her age and health status.

[Kaine for Senate '18]

Would Scalia and Kennedy retire for a Republican in 2013?

Certainly not Kennedy.  Scalia might.

Andrew Napolitano will be a coming. Once he's in kiss abortion bye bye.

Really?  Who retires in this scenario?  Or are you assuming Ginsburg and/or Breyer dies?  Because right now, abortion won't be overruled (Kennedy will stand by the Casey precedent.)

[Kaine for Senate '18]

Kennedy is planning to retire under Mitt.

Source?  I assume you're just making up facts, but if you have any proof it'd be interesting.

[Kaine for Senate '18]

I could see Kennedy hoping to retire under a moderate Republican if he tires of the court.

That's the thing.  I think Kennedy loves being the swing vote too much to actually retire unless he becomes incapacitated, or if he loses his status.  If a liberal is replaced by a Republican, I could see Kennedy calling it quits.