Agreed. This will go nowhere. There is no "one man one vote" provision in the Constitution. There's isn't even a right to vote for President in the Constitution. We only do that because all of the states have chosen to hold elections. They can't use the 14th to enforce a voting right that doesn't exist and can't read it as amending another constitutional provision that it doesn't directly address. This is nonsense. They are only hoping they'll get some activist judges to go along.
They may win a battle in certain state courts, but the Supreme Court will crush them. Earl Warren and William Brennan are no longer on the court.