The Tester campaign had some fun with Congressman Rehberg today with a full page ad in the Great Falls Tribune.

Here’s the ad, which you can click on to allow you to see a larger version.

Rehberg is having a fundraiser tonight in Great Falls at which John McCain will appear, the Great Falls Tribune reports.

The Tester campaign’s ad thanks John McCain for his opposition to Citizens United, which McCain called:

“the worst decision of the United States Supreme Court in the 21st Century.”

The ad then asks that McCain “join us in asking Congressman Dennis Rehberg why he supports this dangerous, out-of-touch Supreme Court decision.”

Congressman Dennis Rehberg defended the U.S. Supreme Court’s unpopular Citizens United decision, and has benefited from the massive piles corporate money that are being spent to run ads to help him get elected.

One of the most prominent corporate groups helping Rehberg is Americans for Prosperity, the TEA Party organization founded by Big Oil billionaires Charles and David Koch.   The Citizens United organization endorsed Rehberg last fall.

Protesters are expected at tonight’s Rehberg event.