But don't spend the entire time lsting off or discussing in detail everything you've done. Talk about passionate reasons for supporting the President, and remember that it's campaigning- maybe talk about some issues you think your fellow state delegates might find important to them, attack Mitt Romney or Republican/Conservative policies in some fashion, have a photo of yourself in it, and an e-mail or phone number members can reach you buy(and maybe include something like, "If you have any questions or concerns please feel free to contact me," .
Then practice your speech, basically following the same format. One big tip I can give you is this- people don't want to hear you talk about every little thing you've done for the county or national party or X candidate, you really need to set yourself out, get their attention, light a fire in their belly, speak organically but not in a manner that makes it look like you don't know or haven't prepared your speech, but do mention your party involvement briefly at some point(I've been a part of this process and it irritates the piss out of me when people get elected to be delegates who have done NOTHING, NO footwork for the local, state, or national party- No, this is not a position that should go to someone only excited about a specific candidate, bugs the heck out of me).
Good luck! ^_^ Feel free to PM me what you've written, I can maybe proof. I think I'm going to run as an At-Large delegate in my state.