Over the past week, Sen. John McCain (R-Ariz.) has rolled out a list of blue-chip GOP political endorsements in his primary contest against challenger J.D. Hayworth — and his campaign said more are on the way. It’s part of a concerted effort to remind primary voters of his stature, as well as an attempt to undercut Hayworth’s claim to be the conservative candidate in the Aug. 24 primary before his challenger can gain any traction. To neutralize Hayworth’s claim on tea party movement voters, McCain has unveiled his backing from former Alaska Gov. Sarah Palin and newly minted Sen. Scott...