The Democrats are 'socialists', and their policies represent 'extreme leftist positions', only in a world where you can call this 'beer'.
In a world with Die Linke, and La France Insoumise and Podemos, the whole notion that the US Democratic Party is somehow 'socialist' is risible. It's embarrassing anyone sharing a continent with them, or even Blair's Labour -- never mind Clause IV Labour -- making such a category error.
Unless I missed Mrs. Clinton calling for the commanding heights of the economy to be placed in the hands of the workers one night while I was sleeping, of course.
Don't think Mrs. Clinton is running, but this fool is...
https://www.hoover.org/research/how-socialist-bernie-sanders