GOP challenger hoping Tea Party darling will counter presidential trump card played by Senate Majority Leader Harry Reid The campaign of Republican U.S. Senate candidate Sharron Angle is preparing to announce an endorsement from conservative darling Sarah Palin, who, it hopes, will motivate the Republican base and turn out voters. Although Angle’s campaign has actively pursued the former Alaska governor’s endorsement, the effect of Palin’s seal of approval remains an open question in a race with so few undecided voters. Republican operatives acknowledged that Palin is a polarizing figure unlikely to sway independent voters, who are key to the race,...