Is witch doctor image racist?

The NAACP and Salon say that Tea Party signs "often" show Pres. Obama as a witch doctor and that that is racist. I haven't seen those signs even though, as the links below demonstrate, I have been to a lot of tea parties.

Would the reverse be true: when a liberal portrays a conservative or libertarian as a witch doctor, would that be racist also?

That isn't a hypothetical questions. Here, for example, is a cartoon from a liberal Seattle Post-Intelligencer cartoonist, David Horsey:

The cartoon is making fun of African culture, is it not? But, since the target is the Bush administration, I expect that no Democrat would think it racist.

PREVIOUSLY on the related subject of Democrats and racism:

•Gov. to require racism in the financial industry
•Obama ally: "I hate white people...."
•Bill Maher explains how "real" blacks act
•Democrats move to their comfort zone
•Black students, harassed for "acting white," get $150,000
•“You can’t vote against healthcare and call yourself a black man.”
•"The city wasn't ready to hire a white police chief."
•A prominent black politician says the white incumbent cannot properly represent black voters.
•San Franciscans discriminate against blacks.
•"He's not black and he can't represent me, that's just the bottom line."
•NAACP defends racism.
•Stanford finds Democrats are racist.
•Obama nominates a racist.
•Leaders acknowledge Democrat base is racist.
•"That's just how white folks will do you." ---Barack Obama.
•Dem says Dem primary voters are racist.
•Dems accuse Bill and Hillary of racism.

PREVIOUSLY on photos, from the San Francisco area, of actual tea parties:
•Long Strange Trip: Hippies defend establishment; Tea Party protests (Jul 18)
•A Tea Party greets Obama in San Francisco and the left is not happy about it
•Collected photos of this year's San Francisco Tea Party events
•Minutemen vs. May Day protesters in San Francisco; Two arrested
•A tax day Tea Party breaks out in San Francisco's Union Square
•A tax day Tea Party breaks out on the San Francisco Peninsula
•To protest Obamacare, San Francisco holds a sick-in (Nov. 15)
•A Tea Party greets Obama in San Francisco (Oct. 15)
•Videos of the October 15 San Francisco Tea Party
•San Franciscans speak to Nancy Pelosi (Aug. 14)
•The San Francisco Tax Day Tea Party Protest in Pictures (Apr. 15)
•Farmers protest in San Jose (Nov. 21).
•Tea Party breaks out in Palo Alto (Nov. 21