Blacks do vote as a block, and consistently wrongly. The Democrat party lives only as long as it's constituents feel like they are getting the short end of the stick and government will give them stuff. That's why the Democrats on the Hill try so hard to make sure that their voters don't feel the burden of individual responsibility, which used to be the hallmark of Americans. Like all democracies, the losers will eventually outnumber the winners, and we'll have a problem in 50 years or so.

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"The problem with socialism is that you eventually run out of other people's money." - Margaret Thatcher