OK, I am going to bite on this and I know I am going to regret it: what's with the right hand VS left hand theory? :)
There are books written about the differences between people who are predominantly "right-brained" or "left-brained." Handedness has a strong correlation with which side of the brain has more control of a person's behavior, outlook, talents, etc.
For example:
Global vs linear thinking
Receiving input through data vs feelings or intuition.
Musical and verbal skills
My worries: since right-handers had not won in a long series of elections, as a generality, were right-handers not 'some factor "x" enough' to appeal to a majority of American voters.