Perry/ Rubio= Landslide!
Actually, Perry / Rubio would be an inspired choice.
Perry's a very reasonable and sane politician with a good track record. He won't excite conservatives, but all in all, independents will probably not find anything overly unpalatable about him. I have a hard time getting excited for or annoyed with Perry, which is probably a pretty good sign for his general election chances. Obama just has this weird energy that was interesting to the country in 2008, but the novelty has long since worn off. A more conventional politician who has proven reasonably competent at running a large state will tower over Obama.
Rubio's a rising star with some excitement behind him. Not so much as to scare independents, but enough to excite conservatives. A solid conservative who can divert a good fraction of the Hispanic vote will pay dividends now and in the future. If we could groom Rubio for 2020, this could be quite an epic coup for us.