The best news for the Obama campaign came in the form of an NBC News and Wall Street Journal poll that pegged the president's lead at 6 points. But again, Obama's 50-44 percent showing Thursday was a regression from a 51-43 percent lead posted in mid-October.

Asked Thursday if the Obama team was confident they would hold Iowa, deputy campaign manager Stephanie Cutter indicated that they perceived the president's chances as good.

"Yeah, it is going to hold," Cutter said Thursday during an appearance on MSNBC. "We feel good where we are."

The Rasmussen poll carried a margin of error of plus or minus 4 percentage points, while the other two surveys' margins of error were plus or minus 3 points.

Mitt Romney announced he will be traveling to Dubuque for a rally Saturday, while Vice President Biden had events in Muscatine and Fort Dodge scheduled for Thursday.