The Republican primary race for Nebraska governor is a dead heat between Attorney General Jon Bruning and businessman Pete Ricketts, while Midland University President Ben Sasse has built a sizable lead over his GOP rivals for the state's open U.S. Senate seat, according to new poll numbers. The Magellan Strategies poll of 525 likely Republican voters was conducted May 8 and has a margin of error of plus or minus 4.3 percentage points. The poll was conducted one day after Bruning received endorsements from Gov. Dave Heineman and Omaha Mayor Jean Stothert. The results were posted online by the Legacy...