Who said My fellow Americans our long national nightmare is over?

This was said by President Gerald R Ford at his taking the Oath of Office on August 9 1974.

The full sentence is:

My fellow Americans, our long national nightmare is over. Our Constitution works; our great Republic is a government of laws and not of men. Here the people rule. But there is a higher Power, by whatever name we honor Him, who ordains not only righteousness but love, not only justice but mercy.