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Republican Sen. Ted Cruz and former state Rep. Chris Herrod will team up in Lehi on Saturday for an afternoon campaign rally.

Herrod is running for the 3rd Congressional District seat vacated by Jason Chaffetz, which includes Carbon, Emery, Grand, San Juan, Salt Lake, Utah and Wasatch counties.

The rally is set for 2:30 p.m. at 4205 Chapel Ridge Road, in Lehi. Admission is free.

A real estate agent and former teacher, Herrod supported Cruz when the senator sought the Republican presidential nomination in 2016. Cruz announced his support for Herrod's candidacy in June, after delegates at the Utah GOP's state convention tapped him as the party's candidate.

But data released this week from a Salt Lake Tribune-Hinckley Institute of Politics poll shows Herrod running last in a field of three vying for Chaffetz's job.

Poll data show Provo Mayor John Curtis, leading the pack by a more than 2-to-1 margin.

Some 37 percent of respondents favored Curtis. Candidate Tanner Ainge was second with 17 percent support and Herrod was third at 14 percent.

A primary election is set for Aug. 15.

Curtis and Ainge, a Utah county financial adviser and the son of Danny Ainge, general manager of the NBA's Boston Celtics, both qualified for the ballot through signature gathering.