Hi.
Since your profile says Washington D.C. I'm going to assume you're a US citizen. If you're not the requirements may vary. As a US citizen you do not need to apply for a visa in advance of going to Haiti. When you get there while going through customs you will be granted a visa on the spot, for a nominal fee (I think it was about $5 US the last time I was there, but don't quote me on it). You won't get denied and if I'm wrong about the price I'm not off by much, so there are really no worries.