The Denver Post reporters John Ingold and George Plavin either don't know what "astroturfing" is, or don't care to correct leftists for using the term incorrectly.  In their report on the Denver Tea Party, they quote Mike "The Headless Chicken" Huttner, as deriding the Tea Parties:

"The tea parties are the latest version in a months-long campaign against change, organized by right-wing think tanks and lobbyists who have done well over the last eight years under George Bush," he said.

He pointed to a number of national conservative political groups listed as sponsors on Taxdayteaparty.com, including FreedomWorks and Americans for Limited Government.