They are ideological purists who disdain compromise and incremental change, which they see as "selling out" liberal ideas like full employment, an end to war, and liberal social policy. Their views can often sound like utopian fantasy where opposing views never exist.
Puritopians dislike Republicans but reserve their greatest disdain for Democratic presidents, whom they relentlessly attack for not meeting a set of ideological goal posts that are constantly adjusted to ensure that the president will be deemed a disappointment, "not progressive enough" or "just like a Republican" no matter what policy achievements are made.
Puritopians routinely dismiss or ignore congress' role in making or impeding policy, believing presidents can simply "use the bully pulpit" in order to overcome constitutional or legislative obstacles.
Puritopians have an affinity for 3rd party politics as a way to punish Democratic presidents. They are especially hostile to President Obama and deem anyone who expresses a lack of ill will toward him to be "Obamabots" and enemies of liberalism.
Puritopian supersedes Emo Progressive. (Seen as too pejorative).
Example2: Puritopians dismissed healthcare reform as a failure, saying President Obama should have used the bully pulpit to achieve a single payer system, despite the fact that Sen. Harry Reid made it clear that such a plan could not pass the Senate.