According to ComputerWorld the FTC has created an Internet Access Task Force to examine whether broadband providers are behaving anti-competitively. Chairwoman Deborah Platt Majoras has framed the issue this way:
I have to say, thus far, proponents of Net neutrality regulation have not come to us to explain where the market is failing or what anticompetitive conduct we should challenge.
First, the quote seems like an invitation for those who support net neutrality to approach the FTC with their arguments. Second, it seems that the question might be put differently so that it asks what anti-competitive behavior we face without net neutrality legislation. The problem may be that proving the undesired behavior now is not possible because it has yet to occur. (Those who have examples speak up and let the FTC know). Even for those who see the NN problem as huge (here’s a link Larry Lessig and Robert W. McChesney’s piece on the topic), the arguments seem quite general and assert that not maintaining net neutrality would lead to X, Y, or Z result but don’t provide the evidence that Majoras appears to want.