On October 10, 2018, Democratic Ann Kirkpatrick and Republican Lea Marquez Peterson participated in a debate in Tucson.

The candidates are vying for the very competitive second congressional district in southeastern Arizona. The district is currently held by Rep. Martha McSally who is running for the open US Senate seat being vacated by Senator Jeff Flake.

Ann Kirkpatrick represented Arizona in the US House of Represented on three occasions from 2005 to 2007, 2009 to 2011, and 2013 to 2017. She ran for the US Senate in 2016 but lost to Senator John McCain. Prior to serving in Congress, Kirkpatrick had a broad career which included being a county attorney in Coconino County, a city attorney in Sedona, and a member of the Arizona House of Representatives.

Lea Marquez Peterson is a longtime Arizonan with strong ties to the business community. She received an undergraduate degree in Marketing and Entrepreneurship from the University of Arizona and a Masters in Business Administration from Pepperdine University. She has personally owned and operated several businesses, including several gas stations in Arizona.