In an interview Thursday with Alter Family Politics on SiriusXM, Sen. Elizabeth Warren (D-Mass.) weighed in on former President Obama's upcoming speech to Wall Street firm Cantor Fitzgerald. Obama is expected to receive at least $400,000 for the speaking engagement. TOMMY ALTER: Senator Warren, what do you think about President Obama accepting $400,000 from Wall Street? SEN. ELIZABETH WARREN: Well, I was troubled by that. One of the things I talk about in the book is the influence of money. I describe it as a snake that slithers through Washington. And that it shows up in so many different ways...