The political left, center and right do share something in common in today's polarized America: we're all in denial.

The first step in 12-step programs begins with admitting that you have a problem for a reason: you can't tackle a challenge whose existence you refuse to acknowledge. "From a psychoanalytical viewpoint, denial is a pathological, ineffective defense mechanism," doctors M.S. Vos and J.C. de Haes observed in their 2006 study of cancer patients. A stunning 47 percent of the patients they polled denied that they had cancer! Denial reduced their chances of seeking treatment and then following through.

"On the other hand," Vos and de Haes observed, "according to the stress and coping model, denial can be seen as an adaptive strategy to protect against overwhelming events and feelings." Denial lets you feel better.