NEW : Newt Gingrich warns that liberal elitism threatens the United States . Mitt Romney gets a key endorsement from Michigan 's conservative governor . Santorum cited negative ads by the Romney campaign and super PAC supporters for the tightening poll numbers , and he sounded resigned to a second-place finish in Arizona . Rick Santorum appears to downplay his victory in August 's Michigan primary . The outcome of the Michigan primary will significantly impact the Republican primary .
NEW : Newt Gingrich warns that liberal elitism threatens the United States . Mitt Romney gets a key endorsement from Michigan 's conservative governor . Rick Santorum appears to downplay his victory in August 's Michigan primary . The outcome of the Michigan primary will significantly impact the Republican primary .