the only constitutional right to vote is in that amendment.
There is a constitutional right to vote in a state election but that was what the founders envisioned. They did not envision that they would be elected by the people. If you remember right, the framers of the constitution were elected or appointed by the states to represent them in the federal government. They never envisioned that there would be national elections except in the term of president.
Senators and the house were appointed originally by the states but that quickly turned to being elected by the citizens(of which a very narrow list of requirements to vote were - male).
But I digress, I could go on and on.
For a really great history lesson, I urge everyone to watch the new HBO miniseries John Adams
Here is one more thing
quote direct from the constitution
Each State shall appoint, in such Manner as the Legislature thereof may direct, a Number of Electors, equal to the whole Number of Senators and Representatives to which the State may be entitled in the Congress: but no Senator or Representative, or Person holding an Office of Trust or Profit under the United States, shall be appointed an Elector
Doesn't this make the superdelegates unconstitional?