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Grover Norquist, the influential conservative activist who is the president of Americans for Tax Reform, will endorse Richard Mourdock over Dick Lugar before next week's Republican Senate primary in Indiana, Yahoo News has learned. Lugar, who has represented Indiana in the U.S. Senate since 1977, has never signed Norquist's " Taxpayer Protection Pledge" never to raise taxes. A majority of Republican lawmakers--and some Democrats in conservative districts--have signed the Americans for Tax Reform pledge. Norquist will join a handful of high-profile conservatives and organizations--including Sarah Palin and the American Conservative Union--who have backed Mourdock, Indiana's state treasurer who is running to Lugar's right with the backing of national tea-party groups. Members of Lugar's congressional staff met with Norquist at the Americans for Tax Reform headquarters in Washington earlier this year to discuss whether Lugar would sign the no-tax pledge, a...