At age 36, Charlie Crystle is many things: a gifted musician who once traveled the world playing "socially conscious'' rock 'n' roll. A computer software entrepreneur whose first company was gobbled up for $70 million. An outspoken and opinionated philanthropist who works for human rights in developing countries. Crystle, by all accounts, is successful. But he wants to add one more title to his resume: U.S. senator. The Lancaster Township resident and Democrat is weighing his first foray into politics, and he wants to unseat -- of all people -- Republican Sen. Arlen Specter, a well-funded, four-term incumbent known for...