[FreedomCalls]

Unconstitutional. Article I, Section 10 of the U.S. Constitution:

No State shall, without the Consent of Congress, lay any duty of Tonnage, keep Troops, or Ships of War in time of Peace, enter into any Agreement or Compact with another State, or with a foreign Power, or engage in War, unless actually invaded, or in such imminent Danger as will not admit of delay.

[ThePythonicCow]

Yup - you beat me to it - guess I spent too much time composing my fancy reply <grin>.

[kabar]

Unconstitutional. Article I, Section 10 of the U.S. Constitution:

The advocates of this system offer the following rejoinder on the constitutionality of this proposal

EVERY VOTE EQUAL: A State-Based Plan For Electing The President By National Popular Vote

[hinckley buzzard]

No State shall, without the Consent of Congress,... enter into any Agreement or Compact with another State,

True, and this "Compact" would be just one 'rat-controlled Congress away from activation.