By Steve Holland MILWAUKEE (Reuters) – Donald Trump is fighting to put a difficult week behind him and finish strong on Tuesday in Wisconsin, a state whose primary contest may prove to be a turning point in the race for the Republican presidential nomination. The Republican front-runner is at risk of losing the Midwestern state to Senator Ted Cruz of Texas, an outcome that would dent the New York billionaire's aura of inevitability and make it harder for him to win the 1,237 delegates needed for the party's nomination for the Nov. 8 election. On the Democratic side, U.S. Senator Bernie Sanders of Vermont is trying to hold on to a slender lead over front-runner Hillary Clinton in the opinion polls in Wisconsin and eke out another victory over the former secretary of state.
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In Wisconsin, Trump looks to put rough week behind him
