No, but it would be nice if they were (not as nice as an Atheist being elected President, though).
Most Satanists are atheists.
What could you expect from a Satanic administration? A reduction in defense and social spending, an abolition of the income tax, an end to Affirmative Action and all such leveling programmes, an implementation of a tax against religious institutions to replace the revenue lost from the income tax, and an end to all mandatory blue laws that interfere with the market by disallowing work on Sunday. I could wholeheartedly support such an agenda.