Was the Catholicism question out of line?

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To reword points already made here, the question wasn't out of line at all, but rather the lack of more questions about their religion (to both candidates) were out of line. Separation of church and state/religious morals are at the heart of many hot button social issues, as well as economic equality and defense.

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Again, is there any other job interview during which an interviewer would be allowed to ask how a candidate's religion would influence his decision? Unless you're applying for a job at the Vatican, it's grotesquely inappropriate.

Is it normal to ask about politics in job interviews in Tennessee?

If you're running for political office, sure. Just as a religious question is fine if one is seeking a religious job. The Presidency is not a religious job.

Right....and yet many use it as one and most voters demand it be one. Herein lies the problem.