Doug Ross of Director Blue notes,

At least four top leaders of the Weathermen terrorist organization have signed on as members of a "grassroots effort" to support the election of Barack Obama. [....]

Progressives for Obama signatories include Weathermen Howard Machtinger, Jeff Jones, Steve Tappis and Mark Rudd. Machtinger helped author the the mission statement of the Weathermen that called for revolutionaries within the United States to wage a 'people's war' and attack from within. The government would fall and 'world communism' eventually would be instituted.