Not that much. Contrary to what you occasionally hear pundits say, Republicans just about always win among wealthy voters. This was true in 2004, where the inflection point was about $50,000 a year, at which level voters began breaking for Bush, with Kerry's absolute weakest performance coming among those who made over $200,000. It was even true in Kansas, where Bush's win grew more lopsided as you wandered up the income bracket.
