Yes, but that would be personal morality, I think.
If we lose it, then as Samuel Adams and Patrick Henry said,
"A general dissolution of the principles and manners will more surely overthrow the liberties of America than the whole force of the common enemy.... While the people are virtuous they cannot be subdued; but once they lose their virtue, they will be ready to surrender their liberties to the first external or internal invader.... If virtue and knowledge are diffused among the people, they will never be enslaved. This will be their great security." - Samuel Adams
"Bad men cannot make good citizens. It is when a people forget God that tyrants forge their chains. A vitiated state of morals, a corrupted public conscience, is incompatible with freedom. No free government, or the blessings of liberty, can be preserved to any people but by a firm adherence to justice, moderation, temperance, frugality, and virtue; and by a frequent recurrence to fundamental principles." Patrick Henry