Exactly! No one has standing on NBC.
Sure they do: other candidates have standing and state ballot challenges allow any citizen, registered voters, or members of the same political party (depending on state election law) to file lawsuits. In 2012, for example, Obama was challenged in 22 states. The problem was that the rulings said that he was a natural born citizen.
For example, in Georgia, citizens challenged Obama’s eligibility to be on the Georgia ballot: Swensson, Powell, Farrar and Welden v Obama, Administrative Law Judge Michael Mahili, State of Georgia Administrative Hearings: “For the purposes of this analysis, the Court considered that Barack Obama was born in the United States. Therefore, as discussed in Ankeny, he became a citizen at birth and is a natural born citizen. Accordingly, President Barack Obama is eligible as a candidate for the presidential primary under O.C.G.A. under Section 21-2-5(b). February 3, 2012
http://www.scribd.com/doc/80424508/Swensson-Powell-Farrar-Welden-vs-Obama-Judge-Michael-Malihi-s-Final-Order-Georgia-Ballot-Access-Challenge-2-3-12