But Lampropoulos, chief executive of Merit Medical Systems, isn't through spending on politics yet. He recently gave Republican gubernatorial nominee Jon Huntsman Jr. a $25,000 check.

The contribution from Huntsman's former rival was part of about $300,000 in contributions added to his growing campaign treasury in August, bringing Huntsman's total take to nearly $2.4 million.

That far outstrips Democrat Scott Matheson Jr., who has conceded from the beginning of the race that he will be outspent by Huntsman.

Huntsman's latest campaign finance details were voluntarily released Wednesday by the campaign, which has made ethics reforms and greater disclosure one of the planks of his platform.

Matheson's campaign has raised more than $1 million through the end of August, said campaign manager Mike Zuhl. "None of it is Scott's money. He has no intention of putting his own money in the campaign."

Huntsman spokesman Jason Chaffetz said Lampropoulos hosted a recent fund-raising event for Huntsman, as did defeated Republican primary candidate Nolan Karras. The $25,000 check was a personal donation from Lampropoulos and Karras chipped in $1,500.

Gerda Greene, mother of Karras' lieutenant governor candidate Enid Greene, also donated $1,000 to Huntsman.

The largest single source of Huntsman campaign cash by far is the candidate. The son of billionaire-philanthropist Jon Huntsman Sr. has donated and loaned his campaign nearly $520,000 to date. The Huntsman family and their chemical company have contributed $230,000.

Patrick Byrne, founder and chairman of Utah-based Overstock.com, gave Huntsman $75,000, making him the single biggest contributor who is not a relative of the candidate. Robert B. Lichfield, founder of a network of treatment programs for troubled youth, is the second biggest non-Huntsman donor, with contributions of $60,000.