Markos does not deserve to be a voice for anything progressive.
For all of the 2015 and early 2016, every other week he asked readers to express their preference for Democratic nominee for President. Every single one came in with Bernie leading, from high 50s to mid 60s preferring him. Nonetheless, on March 15 of this year, he posted a diary saying that it was impossible for Bernie to get the nomination and that Bernie supporters should either only post diaries and blogs in support of Hillary or shut up and go away. Needless to say, many of the Bernie people did go away including me. Others who did not and attempted to continue to support Bernie on dailykos were banned, some temporarily and some permanently.
How's that for working for a big tent Democratic Party?