Why millions of voters still haven't made up their minds: 4 theories

President Obama and Mitt Romney have been campaigning in swing states and flooding the airwaves for months. How can anyone still be undecided?

An Alabama resident urges passersby to vote in the presidential primary on March 13: Nationwide, as many as 10 percent of likely voters still don't know who they'll pick in November.
(Image credit: Win McNamee/Getty Images)

The vast majority of voters decided long ago whether they would back President Obama or Mitt Romney in November. But not everyone is so sure. Despite an avalanche of ads, polls suggest that anywhere from 2 percent to 10 percent of the 130 million people expected to cast ballots can't seem to make up their minds. Stephen Colbert joked that "the fate of our country is now in the hands of people who don't think about what they want until they get right up to the register at McDonald's," says Doyle McManus at the Los Angeles Times. But obviously, it's more complicated than that, and with the rest of the electorate pretty evenly split, both campaigns are waging intense campaigns to win over the undecideds. With the election less than two months away, why are these voters still on the fence? Here, four theories:

1. Bafflingly, they still don't understand the candidates' policies

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