When you ask Joey Jacobsen what it felt like to meet President Obama at the White House, the 14-year-old is speechless at first. "You can't describe it," he begins. Then the Pau-Wa-Lu ninth grader warms to the subject. "Meeting the president, it was so, so cool to see the most powerful man in the world just a foot away from me."Joey and his family - parents Tim and Robbi, and big brother Timmy - traveled to Washington, D.C., and Orlando, Fla., in Joey's role as Nevada's Children's Miracle Network Hospital's Champion Child.He joined children from each state for the whirlwind …