"Rather, the ultimate protector was to be the ruling elite, the gentlemen of leisure who, free of the daily care of laboring in the marketplace," There was no class of leisure in the US.

One man, one attitude.
Two men, two attitudes.
Etc.
The motives may not always been honorable. So, what?
The words explain themselves and compared to the words of any other country at the time was gold among lead. The Constitution and the Bill of Rights is not perfection, but a start toward the desired state for all rational humans, i:e: Liberty. Unfortunately, the actions of politicians and judges have so twisted and distorted the very meanings of the words of the Constitution, that the only rational thing to do is, rather than trying to correct it, go back to square one and Really, Actually, act according to the Constitution before trying to improve it.

"Rather, the ultimate protector was to be the ruling elite, the gentlemen of leisure who, free of the daily care of laboring in the marketplace, could referee clashing particular interests and thereby effect the general welfare."

Here are the occupations of "the gentlemen of leisure"

"Occupations

The delegates practiced a wide range of occupations, and many men pursued more than one career simultaneously. Thirty-five were lawyers or had benefited from legal training, though not all of them relied on the profession for a livelihood. Some had also become judges.

At the time of the convention, 13 individuals were businessmen, merchants, or shippers: Blount, Broom, Clymer, Dayton, Fitzsimons, Gerry, Gilman, Gorham, Langdon, Robert Morris, Pierce, Sherman, and Wilson. Six were major land speculators: Blount, Dayton, Fitzsimons, Gorham, Robert Morris, and Wilson. Eleven speculated in securities on a large scale: Bedford, Blair, Clymer, Dayton, Fitzsimons, Franklin, King, Langdon, Robert Morris, Charles Cotesworth Pinckney, and Sherman. Twelve owned or managed slave-operated plantations or large farms: Bassett, Blair, Blount, Butler, Carroll, Jenifer, Mason, Charles Pinckney, Charles Cotesworth Pinckney, Rutledge, Spaight, and Washington. Madison also owned slaves. Broom and Few were small farmers.

Nine of the men received a substantial part of their income from public office: Baldwin, Blair, Brearly, Gilman, Jenifer, Livingston, Madison, and Rutledge. Three had retired from active economic endeavors: Franklin, McHenry, and Mifflin. Franklin and Williamson were scientists, in addition to their other activities. McClurg, McHenry, and Williamson were physicians, and Johnson was a university president. Baldwin had been a minister, and Williamson, Madison, Ellsworth, and possibly others had studied theology but had never been ordained.

A few of the delegates were wealthy. Washington and Robert Morris ranked among the nation's most prosperous men. Carroll, Houston, Jenifer, and Mifflin were also extremely well-to-do. Most of the others had financial resources that ranged from good to excellent. Among those with the most straitened circumstances were Baldwin, Brearly, Broom, Few, Madison, Paterson, and Sherman, though they all managed to live comfortably.

A considerable number of the men were born into leading families: Blair, Butler, Carroll, Houston, Ingersoll, Jenifer, Johnson, Livingston, Mifflin, Gouverneur Morris, both Pinckneys, Randolph, Rutledge, Washington, and Wythe. Others were self-made men w ho had risen from humble beginnings: Few, Franklin, Gorham, Hamilton, and Sherman."
http://www.archives.gov/exhibits/char...

They don't seem to have been men of leisure.