Lessig's critics understand something Lessig himself seems not to: his campaign is quixotic, his goal of being a "single-issue President" is incoherent given the structure of the US government, and, in a close election year, his prospects of somehow acting as a spoiler for the party he purports to support are far greater than his prospects of actually being an agent for change.
You're welcome to disagree with any or all of that, but I don't think you can say that they don't constitute a colorable argument, and you can't dismiss them as insubstantial points. Which is, of course, the implication of the actual words quoted upthread!
It's not enough just to "put yourself out there". Anyone who does anything dramatic, good or bad, is "putting themselves out there". Boldness makes for good copy, but can't reasonably be taken as a shield from commentary.