(AP) - Curling has officially hit the big time in Olympic sports. The curlers don't have a fat TV contract yet, and Nike isn't trotting out ads featuring them and their brooms. But seven years after making its debut as a medal sport at the Nagano Olympics, curling has what's become a rite of passage these days: its first doping violation. Now put the stones and brooms down, it's not quite what it sounds. Mitchell Marks, a promising young curler, was suspended for two years because he refused to take an out-of-competition drug test in October, an automatic violation. But...