DES MOINES, Iowa-- Leading up to Election Day, Iowa is a revolving door for some of the biggest names in the Republican and Democratic parties.
One political expert says the negative campaign ads might have a bigger impact on undecided voters than the big-name surrogates.
"They make people question the candidate that they're supporting. They also drive down enthusiasm for the candidate that you're supporting which in turn leads to lower propensity to go out and vote," said Rachel Paine Caufield, Drake Assoc. Professor of Politics and International Relations.
For weeks, Iowans have been bombarded by attack ads. The majority of them are for the U.S. Senate showdown between Republican Joni Ernst and Democrat Bruce Braley.
"We've been locked in this same story for so long both campaigns are kind of throwing everything they have into this. This last-minute attempt to win," said Caufield.
That last-minute attempt to win includes visits from super surrogates who rally the troops.
"It has a very marginal effect on the undecided or unlikely voters," said Caufield.
Both campaigns are relying on unknown volunteers to reach voters by phone and by pounding the pavement.