This guy clearly has a bright future at Fox News. It's hard to prove that Media Matters is funded by George Soros when it isn't.
Step 1) "Ambush" the subject and ask a question that has no basis in reality.
Step 2) Upon receiving an answer from your subject that is different from the one you're looking for (because your original question was based on misinformation), simply ask the question again expecting a different answer.
Step 3) See Step 2.