Mystery as IDENTICAL letters appear in 21 newspapers across 12 states slamming Trump's Supreme Court pick – and they're all signed by different people
At least 21 U.S. newspapers ran identical letters to the editor opposing President Trump's Supreme Court nominee Brett Kavanaugh this week
Each letter was published with the name of a different 'signer,' claiming Kavanaugh threatens 'everything that we hold dear as a nation'
Technique is known as 'astroturfing'; it's unclear who's behind it
One editor says the woman who appeared to have emailed him the letter now denies ever sending it
Three prominent liberal advocacy groups that oppose Kavanaugh's nomination have all denied involvement in the campaign.
The White House is shrugging off the technique, whose history includes similar campaigns from the Republican Party and the liberal MoveOn.org
