AHC: Have the Symbionese Liberation Army launch a successful coup against the US government by 2010

Exactly as it says on the tin. I recognize it takes many butterflies to do so, but I've more or less given a 40+ year interval in which the Symbionese Liberation Army (tiny but infamous for capturing Patty Hearst in 1973 and brainwashing her into robbing banks) can get powerful enough to launch a successful coup.

Come up with a means by which they can launch a successful coup in less than 40 years. Whether that is world events, domestic politics, economic disaster, etc.
 
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