This week's Mainstream Media Scream features MSNBC's Martin Bashir, in his "Clear the Air" segment ending his Wednesday show, calling criticism of President Obama over the IRS probe of Tea Party groups racist.

"The IRS is being used in exactly the same way as they tried to use the president's birth certificate. ... Despite the complete lack of any evidence linking the president to the targeting of Tea Party groups, Republicans are using it as their latest weapon in the war against the black man in the White House. ... This afternoon, we welcome the latest phrase in the lexicon of Republican attacks on this president -- the IRS. Three letters that sound so innocent, but we know what you mean."

Media Research Center Vice President of Research Brent Baker explains our pick: "MSNBC hosts are obsessed with race, but it's shameful Bashir would stoop to such tactics to distract from the facts of what happened at the IRS. Bashir is really showing paternalistic racism towards Obama, acting as if Obama can't stand up to criticism."

Rating: Four out of five screams.