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DENVER (AP) -- A conservative group that took issue with a Colorado college offering credit for campaigning for President Barack Obama isn't happy with the response from state officials.

Americans For Prosperity called for a state investigation after Adams State University offered an independent-study credit for working on the Obama campaign. The school withdrew the course because no students signed up. School officials said students could have gotten credit for working for Republican Mitt Romney, too.

The Department of Higher Education said in a letter that the department would investigate if the course were limited to supporters of a particular party. A spokesman for AFP called the response unacceptable and said the group would take up the matter with Adams State administrators.

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