Let see ...honesty, personal integrity, putting the issue to rest. Stop leaving the question open about him being an usurper. Being presidential, which is honesty and personal integrity.
Why we're at it, why don't we demand the Supreme Court settle once and for all whether the sky is blue or the sun rises in the east? The Constitution seems a bit vague on those issues.
The sky is blue or the sun rises in the East are not Constitutional questions, however, being a natural born citizen as a requirement to hold legitimate presidential office is one. No clause or phrase in the US Constitution is without effect.
The issue was put to rest when Chief Justice John Roberts administered the Oath of Office.