The clock on the mantle has ticked past midnight, but Jessica Lundgren is studying -- so she can't afford to think about sleep just yet.

"I'm a single mom to a 5-year-old girl who is fantastic," Lundgren told CNN this week. "I work full-time and go to school full-time. So my day usually starts around 4:45 a.m. and ends close to 1 a.m."

She works at a call center and is studying to be a medical assistant. Long, hard days, but no complaints.

"You do what you have to do in this economy," Lundgren said. "You do what you have to to further yourself."

A few months back, Lundgren was invited to a focus group of so-called "Walmart Moms" and said she was leaning toward voting for Republican Mitt Romney.

But she is undecided now, and Romney has only himself to blame.

"The main thing is because of some of the ads that are coming out," Lundgren said. "The one that sticks out the most is the ad where he was talking -- they had some audio of him about the 47 percent, you know, 'I can't really worry about them.'"

"How can you put your faith and trust in a candidate that doesn't care about everybody?"

A new CNN-ORC International poll shows Romney back in the hunt in Ohio; President Barack Obama leads among likely voters - 51%-47%, but that is within the poll's margin of error.

Four weeks out, the candidates are tied in the suburbs, tied among independents and tied among voters age 50 and older.

And Romney has a big lead among white men, a necessary ingredient to a Republican Ohio victory.

But if there is a warning sign in the new data, it is this: Among white women, the president leads 52%-46%. Back in 2008 when Obama carried Ohio, he received 47% of votes from white women.

Lundgren is no fan of Obama, so Romney still has a chance as she sorts through the barrage of campaign ads that leave her confused.

"It's kind of like picking the lesser of two evils," Lundgren says. "Kind of -- which devil do you want?"

White women are the battleground within the battleground.

"These women matter because we have seen them prove to be swing voters over the years," says Margie Omero, a Democratic pollster who for the past several years has been part of a bipartisan study of Walmart Moms -- defined as working mothers with children under 18 who have shopped at the retailer at least once in the past month.

"In 2008, they voted for Obama. In early 2010, they were a little bit more divided. By November 2010, they were decidedly Republican."

Sarah Minto is among the converts.

She was an Obama 2008 voter but now volunteers three days a week for the Ohio Romney campaign.

"My mind changed when I started paying attention to the deficit and how long it kept going and how many jobs are being taken away," Minto said during a break from neighborhood canvassing for Romney in Columbus.

Of her 2008 choice, she now says: "He let me down. I was very, very hopeful he would be the guy to turn everything around in America and make everything better. He just -- his words were empty."

Omero says other moms are not so sure of their presidential choice and share common concerns.

"Their biggest question is how are the next four years really going to help me and my every day family," Omero said in an interview. "They are worried about putting food on the table. Raising kids who are happy and healthy. Who are going to have a good future. Who are going to graduate into an economy where they can find a job. So they're thinking about all that and they're looking for a candidate who can understand that."

Sharon Wiseman isn't sure Romney understands. And, again, he has only himself to blame.

"The one '47 percent' audio that we all heard -- I feel like he is not in touch with the common person, like the average middle class person," Wiseman told us during a visit to her home in the Columbus suburb of Reynoldsburg.