Three new polls show the billionaire {DONALD TRUMP} extending a healthy lead over retired neurosurgeon Dr. Ben Carson ---- A five-day rolling poll by Reuters showed Trump winning 36 percent of Republican primary voters to Carson's 14.6 percent. ---- A University of Massachusetts survey tallied the two at 31 percent and 22 percent respectively ---- A Morning Consult poll released Tuesday gave found the real-estate mogul pulling in 38 percent to Carson's 19 percent