A little bit, but also, they're selling more than their own election; what thwarts the fulfillment of most of these promises is politics. If Obama had a clearer mandate after the election, and, particularly, in 2010, he'd have had more success delivering.
What are you really asking? Do you honestly think Obama didn't want to close Guantanamo?
I think he made a promise to close Guantanamo without thinking it through. Then he changed his mind.
The fact is, when Ron Paul (or someone like him) says he will close Guantanamo Bay, you know they will close it, by executive order if need be. Obama was content to make an attempt and either change his mind or give up. As such, I have either changed my mind about him or given up. Doesn't really matter which - intentions mean nothing in politics at this point.