Democrats have been very selective about which cartoons they deem cause racial offense. For example, many well-known Leftist cartoonists drew very offensive cartoons of Condoleezza Rice:
This is by the always execrable Ted Rall, who is President of the American Association of Editorial Cartoonists.
Even Pat Oliphant joins the racial stereotyping parade. Actually, Oliphant has been criticized many times for racist caricatures.
You notice that in each of these cartoons, unlike the Post cartoon, there is no ambiguity about who is being mocked and about the racial connotations.