"But if Trump does none of these things and continues to say he is merely looking at a potential candidacy, he would not have to register as an official candidate. The endpoint of this game would likely be the first-in-the-nation primary in New Hampshire, expected to be held early in 2012. If Trump is still publicly talking about a candidacy at that point, and he seeks ballot access, he would have to register as an official candidate.
Another key question is whether Trump could participate in GOP primary debates while maintaining that he is not an official candidate."
How Trump could run and still hide his net worth
Salon.com:
