Polls Show Dead Heat as Michigan Primary Polls Open

◼ Mitt Romney is neck-and-neck with-Rick Santorum in Michigan but has pulled far ahead in Arizona on the eve of key primary contests in both states, according to new polls. - FOX/Detroit

The Public Policy Polling (PPP) final survey of likely Michigan primary voters, conducted Sunday and Monday, found Santorum edging Romney by a margin of 38 percent to 37 percent -- a difference within the poll's margin of error....among those polled Monday who had not yet voted in the primary, Santorum's lead over Romney was even bigger -- 41 percent to 31 percent. But the pollsters said late Monday night that while momentum was swinging to Santorum, Romney held a massive 56 percent to 29 percent lead among the Michigan voters who have already cast their votes -- nearly one in five voters.