U.S. Constitution Article V, the Second Method of Amending the Constitution, intentionally enables the States to bypass Congress and amend the Constitution:
The Congress, on the application of the legislatures of two thirds of the several states, shall call a convention for proposing amendments, which shall be valid to all intents and purposes, as part of this Constitution, when ratified by the legislatures of three fourths of the several states, or by conventions in three fourths thereof, as the one or the other mode of ratification may be proposed by the Congress.