He trailed in nearly every Iowa poll for the last five months, despite the rotating conservative ahead of him.

Gingrich, who was leading in most Iowa polls three weeks ago, is in fifth place at 13 percent.

So will the senator, who jumped to third place in an Iowa poll released last week, jump in?

His Iowa poll numbers dropped 10 points overnight.

When Richardson first began his campaign, his Iowa poll numbers shot up considerably.

But while the more glamorous Democrats stumbled and fell, he endured, rising to first place in the Iowa polls this fall.

Yet in the final fortnight he rocketed from five per cent (in one Iowa poll) to a quarter of the actual vote.

The Iowa polls have been fluid all along, and Romney has always been vulnerable to conservative voters coalescing behind one candidate.

"Maybe she'd seen the Iowa polls."

The latest Iowa poll shows a slip in support for Romney, from 22% support in late October.