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It was all the people who are falling prey to the GOP's crypto-racist substitution of "Muslim" for "ni--er".
By going to the exurban megachurch of Saddleback -- which unlike his old church is White-Approved and White-Sanctified -- and showing his Christian faith, even if it's not of the same flavor as Warren's (McCain's sure isn't), he drives a big fat stake in the heart of the Republican-fueled "he's a Muslim terraist!" garbage being strewn about.
The true hardcore racists won't be swayed, but the millions of fencesitters who don't let racism dictate their every more might be.