Yup, I doubt one can find a single statement of the Founders that ties in with that meaning of the phrase. Not that any of them used it, to my knowledge, other than Jefferson in a single letter.
BTW, democracy is not a moral absolute. It is a way of determining the will of the people, who may very well want to do some highly immoral things.
As we are in the process of seeing in Egypt and other Arab countries, where Islamists are in the process of gaining power through entirely democratic means. As has been wisely pointed out, democracy can be two wolves and a sheep voting on what to have for dinner.
The Founders were far more interested in putting restrictions on democracy than in setting it free.