SALT LAKE CITY -- Rep. Chris Cannon, the five-term Republican facing a stiff primary challenge here over his stance on immigration, has lost a comfortable lead and heads into tomorrow's primary in a statistical tie, according to the latest poll by the Salt Lake City Tribune. The survey of 400 voters found that 44 percent of "likely" Republican primary voters prefer the incumbent Mr. Cannon, compared with 41 percent who prefer developer and political newcomer John Jacob, who promises to crack down on illegal immigration. The three-point gap is within the poll's five-percentage-point margin of error.