Wisconsin Rep. Tammy Baldwin's run for the U.S. Senate is the first race to be endorsed by LPAC, the political action committee formed earlier this year to support candidates and causes that appeal to lesbian voters.

The 50-year-old Baldwin would become the first openly gay U.S. senator if she captures the seat being vacated by Wisconsin Senator Herb Kohl.

Wisconsin voters on Tuesday will decide on her Republican opponent, a point noted by LPAC in an e-mail to supporters.

“Today Tammy's opponents, four anti-gay, anti-choice men, are duking it out in the Republican primary to see who can be the most extreme,” wrote Sarah Schmidt, the group's treasurer. “Tomorrow morning, Tammy will have a challenger, who will be able to spend 100% of his energy attacking her. Secret groups funded by the Koch brothers, the US Chamber of Commerce, and Karl Rove have already spent millions of dollars attacking Tammy. Because she stands up for women. Because she believes in economic justice. Because she's a lesbian.”

Calling Baldwin's campaign “important and historic,” the group announced that it would match up to $50,000 in contributions from supporters, with the goal of raising $100,000.

Glee co-star Jane Lynch, former tennis player Billie Jean King and Chicago Cubs co-owner Laura Ricketts are among the women backing LPAC.