Election Results 2012: Mitt Romney Admits Defeat

David Muir reports on the Republican candidate's defeat.
3:00 | 11/07/12

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Transcript for Election Results 2012: Mitt Romney Admits Defeat
As you mentioned, I'd was a very different scene in boston last night. You could see the shock and sadness on the faces of governor romney's supporters. He made his own gracious speech. David muir has been covering governor romney from the sport. You saw the faces. And you saw his campaign team. They really believed in their theory of the case. They thought they could win this. Reporter: Yeah. No question, george. In fact, they were very emotional afterwards, some of his senior team, as they were leaving here, after that concession speech. And we were hearing in the final days about the ground game, VASTLY outperforming McCain's ground game four years ago. How they were doing with independents in the polling. The last thing that was telling, was that last midnight campaign flight, the trip to the final rally in new hampshire was under way, a senior adviser telling me, it's all going to come down to the economy. The 7.9 unemployment rate. And people in the end are going to vote for romney. I was diving into the exit polls. And romney only beat president obama by one point on trust of handling the economy. The president won by ten points. That was the deciding factor, george. Is there any second-guessing you can detect among the romney team about his strategy? Reporter: Well, you heard him in that concession speech saying that paul ryan and he left everything on the field. He has said that of this campaign, saying we left nothing in this locker room. As they look back in this, they'll look at the biggest missteps as self-inflicted. There was the tape about the 47%, the comments. Then, there was that first debate. It didn't come up in the first debate. They had momentum. Even in the final days, the campaign thought he might have turned it around in that denver debate. Different story, though, this morning, george. David muir, thank you very

This transcript has been automatically generated and may not be 100% accurate.

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