Filed at 4:44 p.m. ET WASHINGTON (AP) -- Gold dollar coins weigh down the pockets. They are costly to ship. And few Americans think they're better than the good old greenback. Dollar coins are a flop even before their third birthday, even after a $67.1 million, three-year marketing campaign by the U.S. Mint, a government report says. While initial public awareness generated by the advertising was strong, the new dollar coin, like the Susan B. Anthony dollar coin, ``has failed to achieve widespread use,'' the General Accounting Office reported Friday. According to July, 2001 statistics from the U.S. Mint, people...