The U.S. Senate race in Wisconsin has tightened to a virtual tie with just three weeks left before Election Day, according to a poll released Wednesday.
The Marquette University Law School poll found that former Gov. Tommy Thompson, the Republican candidate, now leads Democratic Rep. Tammy Baldwin, 46 percent to 45 percent.
The result is much closer than those in polls since early September, which consistently have shown Ms. Baldwin as the favorite to replace retiring Democratic Sen. Herb Kohl. A Marquette poll from late September had her with a 4-percentage-point lead.
Mr. Thompson — who was governor from 1987 to 2001 before serving as U.S. Health and Human Services secretary under then-President George W. Bush — appeared to be the front-runner in the race through mid-August as he battled through the summer to win a competitive four-way GOP primary.
Ms. Baldwin experienced a surge in support following last month’s Democratic National Convention.