Earth to left wingers, America is still 85% white.
The Kenyan’s communist policies are aimed at white people. The left is afraid that white’s will vote as a racial block.
It’s a rational fear.
If you exclude "white" hispanics or latinos, it's actually about 66%. Still a majority, but not overwhelming, since at least 25% of whites can be expected to vote against their own racial interests in a kind of self-destructive frenzy.
http://en.wikipedia.org/wiki/Demographics_of_the_United_States#Race_and_ethnicity