Obama’s problem with independent voters

http://themoderatevoice.com/149949/obama-could-lose-independent-voters-this-time/

Swing voter opinions on Obama and the last four years

http://www.salon.com/2012/06/21/blame_vs_context/singleton/

Bloomberg National Poll:  Swing voters equally split between Obama and Romney

http://www.bloomberg.com/news/2012-06-22/obama-s-race-for-swing-voters-with-romney-tight-in-poll.html

Can a Presidential challenger win over independent voters with a defensive strategy?

http://www.csmonitor.com/USA/DC-Decoder/Decoder-Wire/2012/0711/Mitt-Romney-s-boomerang-attack-strategy-Is-it-effective