The leftism exemplified by this blog post resembles actual leftism. Unfortunately, it only really exists in the confinement zone of social media, and isn't allowed anywhere near the political stage.
What Americans consider "leftist" in their politics is just "socially progressive but center right." Hillary Clinton gets called a Communist, Barack Obama a Marxist. Americans wouldn't know an actual leftist if one threw a Molotov cocktail through their window.
Sure, the people winning elections aren't part of the capital-L Left but that doesn't mean the capital-L Left isn't an important political force even in America.
What Americans consider "leftist" in their politics is just "socially progressive but center right." Hillary Clinton gets called a Communist, Barack Obama a Marxist. Americans wouldn't know an actual leftist if one threw a Molotov cocktail through their window.