you can question a person's qualifications without attacking their personal being.
but it's almost knee-jerk in these stories. the fact that obama is "the first african american president" isn't something i dwell on (i see it as a bonus), and it isn't something that i see obama supporters dwelling on, but it seems to be the republicans' first thought:
wash post:
The first question Republican strategists must ask is how to "handle" the challenges presented by America's first African-American presidential nominee. It's a challenge made even more difficult when self-appointed media referees often work actively for one side. The GOP must recognize that some reporters will portray any criticism of Mr. Obama's positions, statements, ideas or past personal behavior as a racist hit job. Republican strategists are gripped with a real and powerful fear of such a call by media referees. But that"s no reason to quit the competition.
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Bogus Big States Argument
Obama’s Pennsylvania Strategy