From his grandparents, parents, and Frank Marshall Davis, through Mansour, Ayers, Dohrn, Alice Palmer (communist who hand picked Obama to succede her in Congress), onward, through this....
Barack Obama & the Strategy of Manufactured Crisis
Simpson documents his research in his article, providing Web links. He provides a rough flow chart.
Further corroboration on Obama & The Cloward-Piven Strategy:
Obama, Voter Fraud & Mortgage Meltdown, by James H. Walsh, former federal prosecutor.
More on Obama's Marxist alliance with Radical Islamists:
And then there are... Herbert and Marion Sandler, the Pritzkers, and the "loose lips" of Charles Schumer and Harry Reid....