From The Daily Beast:
Russell Dalton, a professor of political science at the University of California, Irvine and the author of 2012’s The Apartisan American, agrees with the assessment that independent/swing voters are about a quarter of the electorate. … Dalton writes, they “are open to political change and will support a third-party candidate who shares their values.”

For the full story, please visit http://www.thedailybeast.com/articles/2014/11/03/how-swing-voters-keep-washington-divided.html.