How can White Americans be Democrats?
1. Wigger-itis... a mental disorder
2. Tradition - they still think it's their grandfather's Democratic Party
3. Poverty - they still hope it's their grandfather's Democratic Party
4. Compassion and humanitarianism - for these, the Dems are the only game in town; grotesquely imperfect as that is
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Republicans measure political success with economic indices.
Democrats measure political success with indices pertaining to the health and well-being and happiness of The People.
If that means they have to play nice with the riff-raff, well, so be it.
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As with most things, The Truth lies somewhere in the middle.