Mitt Romney says his heart said he was going to win the presidency, but when early results came in on election night, he knew it was not to be.

Mitt Romney speaks as his running mate Rep. Paul Ryan (R-WI) (R) and wife Ann Romney (L) look on during a campaign rally at The Square at Union Centre in West Chester, Ohio (Justin Sullivan/Getty Images)

The GOP nominee tells "Fox News Sunday" that he knew his campaign was in trouble when exit polls suggested a close race in Florida. Romney thought he'd win the state solidly.

Romney says there was "a slow recognition" at that time that President Barack Obama would win — and the race soon was over when Obama carried Ohio.

Romney says the loss hit hard and was emotional. Ann Romney says she cried.

The interview was taped Thursday and aired Sunday.