The point is that if voters would otherwise support someone, but they can't run because an inner circle of political elites won't let them, then those people ar

The point is that if voters would otherwise support someone, but they can't run because an inner circle of political elites won't let them, then those people are an obstruction to democracy (slash representative republic). They aren't doing us all a favor by serving as gatekeepers to which platforms we get to support. It's also representative of their opinion of Lessig's views and platforms, which isn't a positive reflection on them, imo. This is also just the nomination, not having him compete as a second candidate in the general election, so whoever would likely beat him would likely still go on to win the nomination. Keeping him out only directly serves to silence him; it's not like Bernie would end up beating out Clinton for the nomination as a result of letting Lessig run alongside them.