Of all the "Romney felt he was gonna win in his gut" stories, this one is the best IMO...

So Governor Romney goes onstage and gives his speech. The crowd just totally embraces him. From beginning to end. Every word. They are fired up. Loud. Positive. Cheering. Just an amazing moment for the campaign. Everybody backstage were all smiles and peeking out at all those people and shaking their heads. This is the kind of moment in a campaign you never forget. Ever. Nobody who hasn’t experienced it can really understand this feeling. You’re looking at a candidate being transformed right in front of your eyes into the next Leader of the Free World. They go from being human into something just a bit more. It’s all those people. That energy. It kind of fills the candidate up and makes them bigger than life. And you arewatching it happen in real time. Right then.

The governor returns backstage and he is smiling and shaking hands, taking congratulations from everybody around him. He’s saying how great it was. Somebody yells out he’s going to win Colorado and the governor laughs and says he thinks so too. And then something very interesting happens. He moves away from the group of people just a bit. Maybe ten or fifteen feet or so. Just enough to have a little space to himself. And enough people notice that the area gets a lot more quiet, and they are trying to watch the governor without looking like they are watchingthe governor. They can all kind of tell something is happening right then. It was described as something very peaceful and powerful that came over that backstage area for a moment. And the governor, he lowers his head and his eyes shut tight and you could see him take a slow deep breath and then he lets it out and says quietly, but just loud enough for some to hear, “Lord, if this is your will, please help to make me worthy. Please give me the strength Lord.” And then his eyes open up, and he’s back to smiling and laughing and shaking hands and being the candidate once again.

I’m 100% convinced Mitt Romney was shaken to his soul right then and there. I think at that moment it was sinking in he might really be the next American president, and it humbled him right to his core, in every nerve of his body. And as he was saying that little prayer, you could hear the sound of thunder from all those thundersticks outside. Like this huge low rumble that just surrounded all of them at once. A quiet little prayer, and the sound of thunder.
The sound of God. Mitt Romney’s Quiet Prayer Amidst The Sound Of Thunder