As legislators squabble over defunding Obamacare in a government funding bill, the top two Republican senators find themselves in the crosshairs, not of a Democratic group, but of a conservative group. Senate Conservatives Fund has declared Senate Minority Leader Mitch McConnell and Senate Minority Whip John Cornyn “turncoats,” after both said they would not support a filibuster by Texas Sen. Ted Cruz to prevent a vote on the House bill that funds the government while defunding Obamacare, a move Cruz hopes will prevent Democrats from amending the bill to fund the health-care law. On Tuesday, McConnell said he supported the...