Aaron Goldstein writes:

It is just past midnight and with 97% of the vote in, Rick Santorum is leading Mitt Romney by 37 votes in Iowa.

Even if Romney should prevail, Santorum is tonight's winner.

A fortnight ago, Santorum was in Bachmann territory and likely headed for the exits.

Now Santorum has a chance to be the Republican nominee. Meanwhile, Romney can't break the glass ceiling of 25%.