The majority of campaigning this election season has focused on that elusive undecided vote--in fact, those who asked questions at the second presidential debate were undecided.

However, undecided voters aren't really a majority of the population, nor could they really swing the election. According to a recent Rasmussen Reports poll, the undecided population is only 2 percent. 

According to Jane Junn, professor of political science at the University of Southern California, of those undecided voters who do end up voting, there are two types: those who voted for President Barack Obama in the last election but are disappointed in him, and those who are leaning towards candidate Mitt Romney but aren't sure if he's quite conservative enough.

"There are very few voters who are truly undecided," said Junn. "They're all voters who are leaning toward a candidate."

Even the questions from the second presidential debate reflected that--and currently, while these voters are still undecided, they are definitely leaning towards one candidate or the other, according to the Huffington Post. And candidates can only campaign to these voters so much.

"There's not much else they can do," said Junn. "They're doing exactly what they need to do."

Junn used the example of Obama surprisingly winning North Carolina last election to explain how energizing the party base can turn an election.

"They should focus on turning out their loyal voters," said Junn. "They should be targeting their base."