A Republican, he represented State Legislative District 7, covering parts of Phoenix, Scottsdale, Cave Creek and Carefree.

During his time at the legislature, Waring was known for his work on veterans issues (selected American Legion Legislator of the Year, National Guard Association of Arizona Senator of the Year three times, presented the Copper Shield award by the Arizona Veterans Hall of Fame and awarded the Medal of Merit by the National Guard Association of the United States), his fiscal conservatism (selected Champion of the Taxpayer, Guardian of Small Business by NFIB and Arizona Chamber of Commerce and Industry Senator of the Year by the Arizona Chamber of Commerce and Industry) and efforts to protect victims of domestic violence.

[1] In 2023, he voted against legislation that legalized accessory dwelling units on lots that were previously strictly zoned for single-family housing.

[2] Following the announcement that John Shadegg would not stand for re-election in 2010, Waring resigned his State Senate seat to run for the U.S. House of Representatives in Arizona's 3rd congressional district.

[3] 2010 U.S. House, Arizona District 3 Primary Election Jim and his wife, Kitty, are the parents of twin boys.