Mitt Romney makes an appeal for Jeff Flake in the latest campaign commercial from Team Flake.

Meanwhile, Team Carmona brings out Robert Redford to help raise money in the final week. The message from Redford:

There are only a few days left before Election Day and key races are still locked in a tie — control of the U.S. Senate hangs in the balance.

One of the races that can determine whether or not we can continue moving the country forward, or go back to extremist policies is the race for Arizona’s U.S. Senate seat.

Winning a seat in Arizona would send a powerful signal across the country. Dr. Richard Carmona remains locked in a heated battle with his GOP opponent in this race — experts say Rich can win it with a strong ground game and an energized Native American and Latino community.

Just recently, Rich’s opponent called for opening the Grand Canyon and its watershed to uranium mining — he called the watershed “prime mining lands.”

This dangerous move could pose a risk to the Colorado River — a drinking water source of more than 25 million people in western states and could have long-term negative effects on the park and other natural resources.

Before spending 12 years in Congress, Rich’s opponent was a former lobbyist and registered foreign agent for an African uranium mining company — a company that is among the world’s largest suppliers of nuclear fuel.