Conservative Nebraska Senate candidate Ben Sasse has opened up a 14-point lead in the latest poll before Tuesday's GOP primary. A Megellan Strategies survey of likely GOP primary voters, 92% of whom said they would definitely vote in the May 13 primary, found Sasse leading with 38%, while liberal Republican Sid Dinsdale is in second with 24%. Establishment Republican Shane Osborn, who is backed by Senate Minority Leader Mitch McConnell (R-KY), is in third with 20%. Sasse is endorsed by former Alaska Gov. Sarah Palin, Sens. Ted Cruz (R-TX) and Mike Lee (R-UT), conservative talk radio host Mark Levin, the...