I have talked (mostly on background) to a number of reporters who were on the Hill that day and covered the incident for both straight-news outlets and opinion publications. Though their stories and perspectives were all a bit different, they agreed on the basics: Unlike the homophobic comments directed at Rep. Barney Frank (D., Mass.), which were heard by multiple reporters, no one in the media actually observed the racist taunts; rather, they pieced their stories together from press releases and statements issued by the involved congressmen and their staffers.
While the reporters I talked to all found this a bit troubling, they nevertheless believed that what they heard from Lewis and Carson passed the smell test.
Most critically, none could account for how, at a gathering that surely featured hundreds of audio recorders, there isn’t a single sound clip that corroborates their stories.
This is despite Andrew Breitbart's $100,000 bounty for any video proof of the incident(s).