There are several prominent examples where a candidate’s momentum seemed to have sagged before turning right back around. … Although the Rasmussen poll gives Mr. Romney the lead in Iowa, other polls conducted at about the same time give him as little as 12 percent of the vote and put him in fourth place there. It is difficult to make definitive statements about what sort of momentum candidates carry out of Iowa because this can vary greatly from election cycle to election cycle. But if Mr. Romney finishes fourth or fifth there, which remains eminently possible, it would make him vulnerable to a number of candidates in New Hampshire and leave the race wide open heading into South Carolina.
Molly Ball reports from Iowa on the hammering Newt is taking there.