This is Gilchrist the founder of the Minuteman Border Patrol, and he is running as a candidate of the "American Independent" Party, called "Constitution" Party in many other places.
http://www.jimgilchrist.com/
His candidacy is unlikely to help a Republican carry the seat.
As a minor aside, his web site appears to have a very interesting technical feature, namely if you click on a radio button to go to the next page, the site appears to reload only the column that is changing, and leaves other columns the same. The equivalent here would reload the main column, without reloading the ads. Of course, this could be an optical illusion, but it would save bandwidth if it were usefully importable.