Investor's Business DailyAmerica's Pursuit Of HappinessWednesday January 2, 6:20 pm ET IbdPublic Opinion: Each time you open a newspaper or turn on a TV, you'll hear how unhappy, glum and dissatisfied Americans are. Don't believe it. The U.S. is, to borrow a phrase, the happiest place on Earth.A long-forgotten 1960s movie title pretty much sums up how Americans feel about their lives: "What's So Bad About Feeling Good?" According to a new Gallup Poll, for most people that's not just a rhetorical question."Most Americans say they are generally happy, with a slim majority saying they are 'very happy,'" according to the Gallup Poll released on the final day of 2007. "More than 8 in 10 Americans ...