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One Million.
540,208 signatures were needed to recall Wisconsin Governor Scott Walker. Today, the Wisconsin Democratic Party turned in 1,000,000 signatures to the Government Accountability Board. If that isn't a loud and clear message to Scott Walker, I don't know what is. In all, over 1,900,000 signatures were submitted in an effort to recall Walker and others listed above.
HT to Bob Cesca and @News3Jessica