President Obama could lose both the Catholic and Protestant vote to the Republican nominee and still win re-election, thanks to the "None/Other vote." A definition:
"Nones" are people without a religious affiliation (this does not mean they are an atheist or agnostic… they may even consider themselves to be religious or spiritual—just not connected to any religious group). "Others" are a survey research catch-all category of people who have non-Christian religious affiliations.
Their voting power:
Twenty years ago the combined None/Other vote amounted to less than 10 percent of the population and the voting electorate. Today, the None/Other population percentage has risen to 22 percent (… and is expected to continue to grow in the future).