U.S. Senate candidate Abdul El-Sayed meets voters at Michigan Technological University last year.

Credit: Wikimedia Commons / Conlan Houston In addition to spending more than $30 million to back Texas Republicans over the years, West Texas oil billionaire Tim Dunn has donated $5 million this cycle to a super PAC backing Republican Mike Rogers' U.S. Senate campaign in Michigan.

The contributions mark Dunn's first apparent foray into Midwest politics.