What does he have in mind regarding a constitutional amendment?
I believe years ago while he was still a student he argued that the “civil rights act” did not go far enough because it did not address income disparity. I’ll check and see if I can find the details.
Also for your reference is this excerpt cited at JSTOR of Frank I Michelman’s article in University of Pennsylvania Law Review, titled “In Pursuit of Constitutional Welfare Rights:One View of Rawls’ Theory of Justice.”
Michelman taught at Harvard when Obama was a student there. According to “Breitbart” Michelman was a major supporter of “Critical Race Theory” pioneer Derrick Bell. “Bell believed that the American legal system enshrined white supremacy, and that the Constitution—even after the Civil War amendments—was fundamentally racist. The only to redeem it, he argued, would be through the passage of amendments that guaranteed socioeconomic rights.”
The above is from a “newsle’ article that mirrors a “Breitbart” article.
http://newsle.com/article/0/58842937/
From these sources it is not hard for me to conclude Obama concurs with a political philosophy that would favor a Constitutional amendment to remove income inequality.