GOP insiders: The 2012 field is set

High-level Republican leaders tell POLITICO that they now believe the top tier of the presidential field is set, and that no major donors or operatives will remain on the sidelines hoping a dream candidate will make a last-minute entry. …

The energy in the party, of course, is currently in the tea-party and social conservative wings—there’s support in those quarters for Rep. Michele Bachmann (R-Minn.), who is increasingly looking like a candidate, and Sarah Palin, whose plans are a mystery. …

But the GOP establishment is now convinced that Mitt Romney is the front-runner, and that Tim Pawlenty and Jon Huntsman have a narrow window to determine who will become the stronger alternative – the anti-Mitt in the GOP field. …

One prominent outside-the-D.C. establishment voice, RedState editor Erick Erickson, told POLITICO Sunday that Palin is “the only game changing candidate” who could still enter the race.