Re:Racial Gerrymandering (Score 1)

It's not that AA voters vote overwhelmingly for AA candidates. It's that they vote overwhelmingly for Democrat candidates. The historical pattern is for White Dems to put up to about 30% AA voters in a majority white district. By doing so, the white dems assured that AA voters did not have the numbers to nominate an African-American candidate in the Democrat primary. But they could assume that the African Americans would vote for whichever white democrat won the primary. So they have just added 30% of voters who are reliably democrat voters in the general election, but who would have no effective voice in the democrat primary.