"It's a shame... but this is life and we have to deal with it, " said the 22-year-old, who vowed to race "with the knife between our teeth".

BBC: Button fears title blow in Brazil

So I'm not necessary sure if that really just considered part of the, part of the race card, but it is certainly a kind of a generational, cultural knife that the Clintons are certainly going to try and use against Obama.

NPR: Injecting Race into Politics