The Iowa caucus results are far enough along that it is apparent that those three are dead meat.
Perry has enough money from the naive Texas fat cats who stupidly back him to continue in New Hampshire, where the electorate will tune him out (other than for the laughs he is good for), but pretty soon even these financiers will realize that Perry is a hopeless cause.
Gingrich will hold on by his fingernails a little longer, but he needs a surge badly. Maybe a few slack-jawed yokels in South Carolina can be conned into believing he is Reagan Reincarnated.
Gingrich was a big supporter of campaign financing by big PACs, and now that arrangement is chewing him up, thanks to the attack ads sponsored and lavishly financed by the Romney supporters.
In the wake of the caucus, we soon will see carcasses!