Honestly, it's too little, too late.
His lack of prompt and promised action re Gitmo is where Obama lost some people who had tentatively supported him. We've seen that here, and I've seen it at other forums as well.
The Democrats were too clever for their own good. They fostered the false impression that Guantanamo was somehow a human rights violation in order to taint the Bush Administration.
The Democrats thought that if they closed Guantanamo and replaced it with an identical facility on US soil, they could hype the closure of Guantanamo to spare themselves from the same taint.
The Democrats never stopped to think that the Republicans might be able to prevent that identical facility from being built on US soil, thereby forcing the Democrats to keep Guantanamo open.