http://billmoyers.com/segment/jonathan-haidt-explains-our-contentious-culture/

(snip)

BILL MOYERS: He could barely say the word compromise.

JONATHAN HAIDT: That's right, that’s right. Because once you've crossed over from normal political disagreement into Manichaean good versus evil, to compromise, I mean, we say, you know, his ethics were compromised, you don't compromise with evil. Now, I think it's especially an issue for Republicans because they are better at doing, sort of, tribal team based loyalties. The data we have at yourmorals.org shows that conservatives score much higher on this foundation of loyalty, groupishness. And the Republican, I mean, which job would you rather have in Congress? The Republican whip or the Democratic whip? You know?

BILL MOYERS: Right.

JONATHAN HAIDT: The Republicans can hang together better. And part of it is, they're better at drawing bright lines and saying, ‘I will not go over this line.’

BILL MOYERS: But governing is all about brokering compromise.

(snip)