Can the president of the United states prescribe what is orthodox in religion, politics, nationalism, or other matters of opinion?

Ann Althouse notes that President Obama, in avoiding using the term "radical Islamists,"

he wants to convey the message that the form of Islam used by the terrorists is an incorrect interpretation of Islam.

This puts the President of the United States in the position of saying what is orthodox in religion. (I'm reminded — and this is Flag Day — of the Supreme Court's Pledge of Allegiance case with the great line: "If there is any fixed star in our constitutional constellation, it is that no official, high or petty, can prescribe what shall be orthodox in politics, nationalism, religion, or other matters of opinion...".) But that's his approach and he's sticking to it.

...There are some people who think you're confused about what our enemies are. They think you might be denying that these people do believe in their religion, recruit through religious belief, and act because of religious belief.

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