The brain neurons of liberals and conservatives fire differently when confronted with tough choices,suggesting that some political divides may be hard-wired,a study says.

http://www.abc.net.au/news/stories/2007/09/10/2028113.htm?section=justin

However, conservatives were less flexible, refusing to deviate from old habits "despite signals that this ... should be changed".

Whether that is good or bad, of course, depends on one's perspective: one could interpret the results to mean that liberals are nimble-minded and conservatives rigid and stubborn.

Or one could, with equal justice, conclude that wishy-washy liberals don't stick to their guns, while conservatives and steadfast and loyal.

I guess that explains "STAY THE COURSE!"