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I didn't know it was a secret that Obama was an extreme leftist? I thought this was pretty common knowledge, across the board.
You know they're are several neutral/bipartisan outlets out there that rank each senator every year according to how liberal or conservative they are based on their voting record. In 2007 Obama had the most liberal voting record of any U.S. senator, therefore making him the senator who was furthest to the left...more then Kennedy, more then Reid, more then Pulosi or anyone else on the left.
