Rep. Kyrsten Sinema (D-AZ) won one of the tightest races in the country on Monday, breaking a decades-long Republican winning streak to become the first female U.S. senator from Arizona.

The next presidential election is still a few years away, but Arizona's senators could be contenders in a wide-open ...

The next presidential election is still a few years away, but Arizona's senators could be contenders in a wide-open ...