Contrary to what would be convenient to your thesis on the foundations of our form of government, the elders and representatives of the Hebrews did not discuss the laws of God (Ex. 19:7) or vote on them (Ex. 19:8). Moses presented the laws bestowed upon him to the people and they bowed subserviently to them as the written word of God. (A God, by the way, who demanded total submission. Not unlike a dictator, albiet the ultimate benevolent dictator.)
Sorry.
Wait!! Before I get bashed - I do believe the foundatiuons of our form of government can be traced to biblical values and ideals. I just think the referenced passages don't prove the point very well.