More outside money flows into Wisconsin's U.S. Senate race - WKOW 27: Madison, WI Breaking News, Weather and Sports

MADISON (WKOW) -- Karl Rove's political action committee, Crossroads GPS, is pouring another $1.2 million into ads attacking Democratic candidate for U.S. Senate Tammy Baldwin.

The group unveiled its latest ad on Wednesday. The spot calls Baldwin "too extreme for Wisconsin."

Rove's group just made a $961,000 ad buy in Wisconsin last week, after previously spending $500,000 on anti-Baldwin ads.

Also on Wednesday, Governor. Scott Walker and former U.S. Rep. Mark Neumann sent fundraising emails on behalf of Baldwin's Republican opponent, Tommy Thompson.

Four polls taken over the last week show Baldwin leading, and Thompson recently admitted his campaign was broke after the mid-August primary.

Baldwin and Thompson meet for the first of three scheduled debates on Friday, at the WMVS-TV studios in Milwaukee. It will be broadcast on WKOW-TV starting at 8:00 p.m. Friday night.