Who runs the elections?

One of my friends lives in New Zealand and expressed frustration at the media's discrepancies in the delegate totals of each candidate. She included one of her Kiwi friends on the email and he asked, "Who runs the elections in the U.S.?" Quite frankly, I didn't know, so I did some research and here's what I replied:

Ok, so each state decides how its voting or caucus process works. Some vote for delegates, some vote for specific candidates, and some caucus for a candidate or remain uncommitted. Each political party decides how delegates are allocated. In addition to delegates, both parties have superdelegates - people who are selected in ways other than by the voters (Democrats have much more than Republicans).

Here's an ask Yahoo answer about it:
http://ask.yahoo.com/20040213.html

and

http://www.vote-smart.org/election_president_how_primary_works.php

Why there's a discrepancy with the delegate counts in the news:

"The delegate counts are not really 'counts.' They're really delegate estimates," the director of surveys for CBS News, Kathy Frankovic, said yesterday. She said a key reason for the largest discrepancies is the different standards news organizations have about when to add delegates to the total.

http://www.nysun.com/article/69893