"FOND du LAC, Wis.—A month ago, many people in this state presumed that Tommy G. Thompson — still a household name here after serving an unprecedented four terms as governor — had a lock on the Republican nomination for the Senate.

Not anymore.

Wisconsin, which has seen more than its share of bare-knuckle politics over the past year, is the setting of an increasingly bitter three-way GOP Senate primary fight whose outcome later this month is anyone’s guess."

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