Perfectly stated. It doesn’t get any clearer than that.
Article IV Section 4 of The Constitution states:
SECTION 4. The United States shall guarantee to every State in this Union a Republican Form of Government, and shall protect each of them against Invasion; and on Application of the Legislature, or of the Executive (when the Legislature cannot be convened) against domestic Violence.
Seems to me that any state which chooses electors based on a process that deprives its citizens of their consent is unconstituional. However, there is this:
In Luther v. Borden, the Supreme Court established the doctrine that questions arising under this section are political, not judicial, in character and that “it rests with Congress to decide what government is the established one in a State . . . as well as its republican character.”