According to this story, Effective Leadership for America, a Republican PAC that supports the Republican nominee for U.S. House, Arizona First District, is also spending money to boost the Green Party nominee in the same race. The incumbent Democrat. Ann Kirkpatrick, is not running for re-election. In 2014 she defeated her Republican opponent 97,391 to 87,723. No minor party or independent candidates were in this race in 2014.
The 2016 Green Party nominee in this race, Ray Parrish, was nominated in the 2016 Green Party primary with 66 write-in votes. A Libertarian, Kim Allen, ran in the Libertarian primary in this district this year. Allen received 144 write-ins in the Libertarian primary. But under discriminatory Arizona election laws, the Green candidate only needed one write-in to be nominated in his primary, whereas the Libertarian needed several hundred. So the Green is on the November ballot but the Libertarian is not. This law was written in 2015 by the Republican-majority in the legislature, and is being challenged in U.S. District Court by the Libertarian Party. Thanks to Rick Hasen for the link.