http://thefederalist.com/2019/03/12/bernie-sanders-now-moderate-democratic-presidential-candidate/
In 2016, it seemed unlikely that Sen. Bernie Sanders—technically not a Democrat—would become one of the most important figures in Democratic politics and arguably the moderate candidate in the 2020 presidential field. Many may not believe it now. After all, he’s a self-described socialist. But it’s a true story that says as much about the Democratic Party as it does Sanders.
Campaigning in Iowa, Sanders bragged that the major planks of his 2016 campaign—Medicare-for-all, “free” college tuition, and a $15 minimum wage—were considered “radical “ then but are Democratic Party dogma now. He is not wrong (Sanders might have added that he was the godfather of the Green New Deal). Bernie has gone from persona non grata to acceptable presidential nominee among his Democratic Senate colleagues.
Democrats’ leftward lurch was not due solely to Sanders’ 2016 campaign. President Obama’s misgovernance reduced his party to its bedrock supporters, who leaned heavily left. Once the supposed “centrist” Hillary Clinton lost to Donald Trump based on blue-collar states, progressives pounced on the chance to argue Sanders could have won and his issues were the future of the party. (Conservatives often make the mirror argument when Republicans lose, which is how we got the Tea Party in 2009.)