Even in the midst of a bare-knuckles presidential contest, the TV ads saturating the U.S. Senate race in Minnesota are among the toughest in the nation.
In one, there's Sen. Norm Coleman, introducing videos showing his opponent, Al Franken, erupting in obscenity-laced rages a few years ago. "I'm mean sometimes," Franken explains in one scene.
In another, there's a woman struggling for composure as she recalls the death of her son, Stuart, in Iraq. "I don't blame the Army for our son's death," she says. "I just blame the bad policies on President Bush, Norm Coleman, who voted for this."
With six weeks to go in the Senate race, the two leading candidates and their allies are using increasingly harsh messages to reach voters -- even as evidence mounts that their darkly calculating behavior may be chasing supporters away. They're making the risky bet that going more negative now will produce positive results in November.
The intensifying crossfire of hard-edged advertising in the close race is showing once again that such attacks remain a staple of political campaigns, despite voters' professed disgust with them.
Negative ads tend to be remembered longer than positive ones, research says. But there's a possibility of a backlash.
That's because a negative ad tells voters something about the attacker as well as the attacked.
"A negative ad, if it is successful, will lower the voter's evaluation of both candidates," said Matt Grossmann, an assistant professor of political science at Michigan State University. "It will just lower the evaluation of the candidate the ad is run against more."