Once the three presidential debates were done, the emphasis in the two weeks before Election Day shifted to the ground game -- convincing supporters to get out there and vote.
That includes convincing voters in other states to vote as well.
At the Obama campaign site, if you sign up, you can call supporters in any state. You can choose any swing state, Ohio, Virginia, Florida, Colorado, you name it.
And you can call specific groups -- Jewish-Americans, teachers, women, Latinos. Its state-of-the-art campaigning.
Volunteers are hunched over phones at the Obama Organizing for America office near Central and Camelback in Phoenix.
"Well when we do phone banks we call people, we want to come in and make phone calls to other democrats or independents and try to get them to vote," says Nora Arroyo-Mendez, Obama supporter.
There are appeals to every group of voters, like Latinos and LGBT voters. There's also a big push for women voters.
Theresa Udelman is one of the volunteers making the calls. She's wearing a button that says "Smart Women Vote Obama." Theresa says she's getting a good response.
"I would say 95% of the people I have contacted and spoke to today support the president and all the other democrats. There have been a few that have not answered, I left them a message to get out and vote early."
The Romney campaign does not have anything like the Obama operation in the valley.
By looking at the Romney website, we see that supporters can call voters using the site. We checked it out and all the calls went to voters in Colorado. But it is a lot less technologically sophisticated than the Obama website.
The Romney campaign in Arizona did not respond to an interview request today.
Both sides are working hard to turn out their supporters on Election Day.