[Update] Here is the response I received to my email...
Thank you for your recent correspondence regarding Visa’s advertising.
As a brand that was built on the trust and respect of its consumers, Visa values input from the people who use our products every day. Feedback such as yours is vitally important to our business.
We have forwarded your comments regarding the Glen Beck Show to our media-buying team. You can be assured that your views - along with those of your fellow consumers - will be taken into account as we plan for the future.
Again, thank you for taking the time to let us know your thoughts on this important topic.
Today we are contacting Visa, here is my email...
Ladies and Gentlemen:
I am writing to ask you to discontinue your sponsoring of Glenn Beck. He spreads hate, incites and encourages anti-government sentiment and encourages race baiting. These practices negatively impact your customers, Glenn Beck is bad for your business.
Do the best thing you can for your business and discontinue your sponsorship of Glenn Beck.
Please contact Visa with me and help Stop Beck!
You can also contact Visa directly at 415-932-2564. This number is monitored Monday - Friday 9am-8pm EST. Thank you to an Anonymous commenter for the information.