Poor old Mr. Big News (Giant's Causeway). He very quickly turned into yesterday's news, didn't he? The dust had barely settled on his breakout success, in the Oaklawn S. Saturday, when his trainer supplanted him with a rather less welcome headline of his own. True, Bret Calhoun's Class B violation--reported in Wednesday's TDN--was a relatively modest affair. Though cannabidiol is the second most active ingredient in marijuana, it is evidently considered fairly innocuous. In view of his overall record, and mitigating circumstances, the Kentucky Horse Racing Commission stayed two-thirds of...