"How can any Republican senator vote to elevate to the Supreme Court a judge who, all her life, has believed in, preached and practiced race discrimination against white males, without endorsing the Obama-Sotomayor view that diversity trumps equal justice, and race-based justice should have its own seat on the high court?"
In Buchanan's world, all racial groups--foreign and domestic--are competing, in a zero sum game, for the largest slice of the American pie. So a woman who spends much of her life trying to improve the livelihoods of Latinos and Hispanics is, just by default, preaching and practicing race discrimination against white males.
This is the same attitude we heard in Obama's Inaugural Address. White Americans believe in democracy, fairness, reason. Brown indigenous people believe in tribal politics, self-interest, emotions.
In other words, indigenous people are more primitive and savage than we are. So it's okay to invade their lands and kill them (e.g., Columbus in the "New World," Bush in Iraq).
For more examples of Buchanan's racism, see:
American patriots have same DNA?
Mestizo leaders = "scrub stock"?
Buchanan: Helping Indians = "pigout"
For more on Sotomayor's nomination, see Sotomayor Favors "Reconquista"?