That grinding sound you hear is the left collectively gnashing its teeth, which it does every time Palin says something.

(Daily Caller) — Sarah Palin tweeted into the growing controversy over Michelle Obama’s decision to invite Chicago rapper ‘Common’ to a White House arts event for students.

“Oh lovely, White House,” she said about Common’s “A Letter to the Law” rap-poem, which was transcribed and published in yesterday’s Daily Caller. The 2007 rap includes threats to kill police and a call to kill then-President George W. Bush.

“Them dick boys got a lock of cock in them

“My people on the block got a lot of [Tu]pac in them. . .

“Burn a Bush cos’ for peace. . .”

The planned event, titled “An Evening of Poetry,” may prove especially awkward for the White House, because the President is scheduled to deliver opening remarks at the event, which is to be streamed out via the Internet.

Officials at the First Lady’s office in the White House declined to comment.

Keep reading…