(CNN) - An independent, conservative group spent $1.2 million on a new television ad targeting Rep. Tammy Baldwin, the Democratic candidate in the heated Wisconsin Senate battle.
The commercial, made by Crossroads GPS, will run on local and broadcast networks in the Badger State beginning Wednesday.
"Tammy Baldwin's tax and spending agenda is just too extreme for Wisconsin," the ad's narrator says.
The commercial slugs Baldwin, a seven-term U.S. congresswoman, for "rubber stamping" legislation passed when Democrats had control of Congress during President Barack Obama's first two years in the White House. The ad mentions the so-called Wall Street bailout, health care reform and the American Recovery and Reinvestment Act, also known as the stimulus bill.
"We just can't afford Tammy Baldwin's tax-and-spend rubber stamp in Washington," the narrator says.
Her campaign responded to the ad Wednesday, saying the Karl Rove-backed group was wasting its money on the race.
"Despite spending over $6 million attacking Tammy Baldwin this year, all the public polls show we are moving in the right direction. The fact that Karl Rove spent one million dollars attacking us last week and another one million dollars this week, proves that point," John Kraus, the campaign's communications director, said in a statement.
Baldwin is running against former Wisconsin Gov. Tommy Thompson, who captured the GOP nomination in a crowded primary last month.
An NBC/WSJ/Marist poll released Thursday indicated Baldwin slightly ahead of Thompson, 48%-46%. The margin was well within the survey's sampling error. Two days earlier, however, a separate Marquette University poll showed Baldwin leading by nine points.
Thompson attributed the wide margin to Mitt Romney's negative headlines. At the time the poll was released, the Republican presidential nominee was playing defense on secretly recorded footage that showed him making controversial comments at a fund-raiser.
"The presidential thing is bound to have an impact on every election," Thompson told Madison television station WKOW last week. "You know, whether you're a Democrat or Republican. If you're a standard-bearer for the presidency is not doing well, it's going to reflect on the down ballot."
A CNN Poll of Polls which averaged the three non-partisan, live operator surveys that were conducted earlier this month indicated the president with an 11-point lead over Romney in the presidential race in Wisconsin.
The Wisconsin Senate race has been a prime contest on Crossroads' radar, as the conservative group co-founded by Karl Rove has aired several commercials in the state, hoping the GOP can grab the open seat currently held by retiring Sen. Herb Kohl, a Democrat, and retake the Senate majority.
Political handicapper Stuart Rothenberg labels the race as a "toss up/tilt Republican," while another analyst, Charlie Cook, rates the contest as a pure "toss-up."
– CNN's Peter Hamby and Paul Steinhauser contributed to this report.
Here is hoping that MONEY cannot change minds, that FACTS matter, even to voting Republicans.
The fact that they (CrossRoads) are unable to create advertising in support of their candidate should weigh heavy on the viewer.
And that wonderful human being Thompson can't fight this woman on his own, therefore Karl Rove's organization has to step in with all their money to help Thompson win against a relatively unknown woman.
Election day is near when Karl Rove (Darth Vader) and Crossroads GPS begin the political mudslinging in earnest.
11 points in Wisconsin!? WOW! I LOVE CNN"S "NON-PARTISAN" SURVEYS!!
Mitt Romney will lose this race and he ought to know why. He enlisted the help of unpatriotic, amoral, lying people and had the audacity to say on tape that he was only interested in 51% of the vote no matter how he got it. I don't think Americans across this land, want people like that in the White House. We have watched screaming, bigoted, hate filled, extremists like Alan West, Michele Bachman, RIck Santorum, Rush Limbaugh, FOX News people, Karl Rove, and countless others of lesser renown and we know these people don't identify with Americans who work hard, who are courteous, kind, and generous. When we see Repubican governors trying to prevent people from voting, we know these people have sunk to a level to attain power that is beyond anything we middle class Americans could ever rhave imagined and that we cannot give them power. This election should show Americans that democracy can be at risk if we allow a group or a fringe of society to attain power.