Jimmy Carter claims that the opposition to Obama is racist. Carter is and always will be a failed President and a failed ex-President. Unlike Nixon who worked with Presidents and tried to help the Country, Carter promotes himself. He should stick to building houses for homeless people a job which he did well.
The media points to a sign that read "Hitler was a great speaker" as proof of racism. This is quite amusing in that there is absolutely nothing racist in that statement. In fact it is a historical caution against a person who some of his followers see as trying to develop a cult of personality. While the statement is over the top there is nothing racist about it.
The birthers are wrongly beeing portrayed as racist. Ideally, I would love Obama to produce his birth certificate and have it verified by the federal document lab. This would not end the conspiracy minded true believers, but it would blunt the vast majority. President Biden would be actually worse than Obama as he has never had an intelligent thought in his life.
We can argue that some of the claims of Socialism are over the top. However, complaining that criticizing an expansion of government is racist doesn't pass the logic test. Is the imbecile Carter claiming that because Obama is biracial that he and his policies are above criticism? That attitude would be racist.
Obama supporters use one or another iconic image and the ripped off Pepsi logo. His detractors satirized those images in the same spirit of political cartoonists. The most common picture was Obama as the Joker. This is what satire is about and it isn't racist.