Warner Huston points out that when Barack Obama was first elected to the Illinois State Senate in 1996, he sought (and received) the endorsement of Illinois' Marxist New Party:

The New Party was a Marxist political coalition whose objective was to endorse and elect leftist public officials -- most often Democrats. The New Party's short-term objective was to move the Democratic Party leftward, thereby setting the stage for the eventual rise of new Marxist third party.

Most New Party members hailed from the Democratic Socialists of America and the militant organization ACORN. The party's Chicago chapter also included a large contingent from the Committees of Correspondence, a Marxist coalition of former Maoists, Trotskyists, and Communist Party USA members.

The agenda of the New Party is laid out here. This doesn't demonstrate that Obama is a Marxist, nor does it prove that he agrees with the full agenda of the New Party. In states where many parties earn a spot on the ballot, it's typical for politicians to seek the cross-endorsement of minor parties. However, you don't seek (or receive) the endorsement of a minor party unless you have a certain comfort level with the party's agenda. Again we see that Barack Obama is pretty comfortable with some radical ideas and people.

More from Rick Moran here.