In the United States, "We The People" are sovereign. America has no king. The people rule. They have the power of the ballot box, the jury box and the cartridge box, and in this land of freedom, nothing is more important than the jury box. The right to a speedy trial by a jury of one's peers is a benchmark of liberty.
Juries have incredible power. Not only do they have power over the fate of the accused, but they also have power over the accusers. No one has more authority than a jury—not even the judge, in most cases. A constitutionally literate, fully informed jury is pretty much all that stands between the ballot box and the cartridge box.