HIGH POINT, N.C. — The usually buttoned-up Mitt Romney repeatedly gave a thumbs-up. He passed around dozens of high fives. And at every stop, he clapped the back of his new sidekick, Paul Ryan. This was Romney unplugged, clearly energized by his youthful running mate and thrilled with the enthusiasm Ryan's selection created among Republicans in the opening act of the new team. "I am so happy!