From the June 29 edition of SiriusXM's Media Matters Radio:
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On March 26, Bill O'Reilly said that marriage equality opponents offer weak arguments, stating they have not been able "to do anything but thump the Bible." Rush Limbaugh took offense to this, saying the next day that O'Reilly "marginalized" Fox News viewers. O'Reilly responded on April 2 by defending his original comment.
Here's the feud in one minute: