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Rumors have circulated that Colin Powell will endorse Barack Obama for months. Might Sunday finally be the day? Powell is scheduled to appear on Meet the Press on Sunday, and no one’s quite sure what he plans to talk about. Powell has advised the last three Republican presidents, and was once mentioned as a potential running mate for McCain. “It’s going to make a lot of news, and certainly be personally embarrassing for McCain," a McCain official said of a potential endorsement. "It comes at a time when we need momentum, and it would create momentum against us.”