In many cases, the final messages reflect the uniqueness of the states. An ad by Republican Sen. Scott Brown touts his independence in Democratic-dominated Massachusetts against Elizabeth Warren, who has a slight edge. Republican Senate candidate Linda McMahon in Connecticut has an ad urging Obama supporters to also vote for her in a state where Obama has a wide lead.
Former Surgeon General Richard Carmona, running as a Democrat in conservative Arizona, appeals to independent voters, about a third of the electorate. "Let's just get somebody there who will listen and start solving some problems," he says in his latest ad.
Republican opponent Jeff Flake's final pitch shows images of him with the state's two GOP senators, John McCain and Jon Kyl, as well as with Romney. Carmona is shown with Obama and House Democratic leader Nancy Pelosi. "It's a choice," the ad's narrator says.
While Democrats rarely refer to Obama, Democrat Tammy Baldwin in Wisconsin features Clinton in a commercial that aims to harness some of the former president's star power in her tight race against Republican Tommy Thompson. Thompson's latest ad features a testimonial from his wife.
Republican efforts to nationalize races in conservative-leaning states have been frustrated in Indiana and Missouri, where the GOP candidates have stumbled as they discussed their opposition to abortion in cases involving rape.
Democratic Sen. Claire McCaskill's latest ad in Missouri features women talking about Republican Todd Akin's comment that women have the ability to avoid pregnancy during a "legitimate rape."
"Todd Akin is scary," said one of the women featured in the McCaskill's ad. "I'm afraid of what he'll do in Congress."
Akin is trying to steer voter attention back to the economy, making the case that he would lower taxes as a way to spur job creation.