It’s hard for a guy with a dominant personality like that to be a VP candidate - he’d overwhelm the presidential candidate.
I suspect he knows this and likely would not do it, but possibly run for President in 2016 (or more likely 2020 due to it looking like Romney will win in 2012).
Christie said the same thing but I don’t completely agree, he’s all about fiscal policy and could carry a pro growth, low taxes message for Romney. But yeah, it’s a consideration. I’d go for Rubio and let him give half his speeches in spanish in a direct appeal to hispanics. That’s just me.