Six states look to be election toss-ups, according to NBC: Florida, North Carolina, Ohio, New Hampshire, Arizona and Utah.
More than 26 million voters have already cast early ballots, nearly double the amount of early votes at this time in the 2012, NBC reports.
A normally red state, Arizona has emerged in 2016 as a presidential battleground.
Officials say Arizona will get the highest premium hike of about 116-percent next year.
CNBC's Contessa Brewer reports The Grand Canyon State is still up for grabs with Hillary Clinton narrowly leading in the polls.
San Diego Mayor Kevin Faulconer (R) and Phoenix Mayor Greg Stanton (D) weigh in on the state of the U.S. economy as well the immigration debate.
Blue Cross Arizona resumes coverage in Pinal County, CNBC's Bertha Coombs reports.
Arizona's Pinal county will not go down as the nation's first region to have zero Obamacare plans next year.
Three high-profile incumbents, including Rubio and McCain, have beat back primary challengers in Tuesday's primaries, NBC News reports.
The warning comes after the agency detected breaches against state voter registration databases in Illinois and Arizona.
The Federal Bureau of Investigation has found breaches in Illinois and Arizona's voter registration databases.
Republican presidential nominee Donald Trump tweeted on Sunday that he would make a major speech on illegal immigration in Arizona on Wednesday.
Ramen noodles have become the most valuable "currency" among U.S. prisoners, a study reveals.
CNBC looks at jobs and wage data to gauge the impact in battleground states in this year's presidential election.
Arizona's fresh-thinking approach embraces transformative business models such as Airbnb and Uber, so every resident can be an entrepreneur.
The Grand Canyon State is riding high with qualified workers despite an education system that is among the nation’s worst.
Some states have made big economic strides. Others are falling short. Here's a look at movers on CNBC's Top States for Business 2016.
Soaring temperatures across the Southwest are spurring wildfires and forcing evacuations.
Residents in Arizona, California and Nevada face scorching temperatures ahead, as hot as 120-degrees in the next few days.
NOAA's Climate Prediction Center estimates how much above average temperatures are going to be over historical summers.