Jay Em Ess Stable's Happy Medium (Runhappy) dominated for a third consecutive time Saturday to become the third 'TDN Rising Star' for the heating-up Runhappy. Third in his seven-panel unveiling here back in March, the $300,000 KEESEP yearling and May 20 foal resurfaced at Belmont Sept. 30 to air by 9 1/4 lengths and earn a gaudy 103 Beyer Speed Figure. He was flattered when three runners who finished behind him that day returned to graduate, and further validated his big win with a five-length allowance score in the local...