Crossroads' latest offering in the Show-Me State ties McCaskill to Obama. Democrats counter that while outside groups have spent $6 million against her, her standing in the polls has plunged too deeply. A Democratic poll conducted in early may showed McCaskill leading each of her three opponents, but under 50 percent mark against all three. That means she is very vulnerable. While her charge against outside groups may move a few voters at the margins, such kinds of process arguments can't upend the balance of power in a race. The Crossroads ads are much more a blessing for the GOP than an opportunity for McCaskill in this circumstance. -- Bob Kerrey will likely lose to Deb Fischer in Nebraska, but the national Democrats who scrambled to recruit him after Ben Nelson passed on a reelection bid didn't go to all the effort for nothing. Save for Kerrey, Democrats had no one to turn to in the Cornhusker State, and Crossroads wouldn't likely even be on the air there today if a no-name Democrat was running in Kerrey's stead. Even if Fischer wins easily, Democrats can say they made GOP groups spend money where it wouldn't otherwise be needed. Still, that argument will be little comfort for Harry Reid next year if Mitch McConnell is the Senate's new majority leader.