Romney said "bless his heart" about Obama.

How disrespectful is that?

A preemptive “don’t even try it” to the media: It is not racist in the slightest.

Here's the Urban Dictionary's top entry for "bless your heart":

1. This is a term used by the people of the southern United States particularly near the Gulf of Mexico to express to someone that they are an idiot without saying such harsh words.

2. "You are an idiot but I like you and care about you so I dont want to hurt your feelings."

 ADDED: Here's an old Metafilter discussion:

"Well, bless your heart!" and "How nice for you!" are two of my favorite barely-veiled criticisms. Can you provide me with some more?...

"Isn't that special."...

"Duly noted."...

"Good luck with that."

"Thank you for sharing."...

"I'll keep that in mind."