I don’t think that’s the case at all. Not everything has been successful, and in many cases efforts got watered down so they could pass congress. However, Obama and Biden have pushed for some pretty serious left wing talking points. Some examples off the top of my head:

-Medical reform

-Student loan forgiveness

-Renewable energy initiatives

-Marijuana rescheduling

-Repealing Don’t Ask Don’t Tell in the military

-Immigration clemency with DACA

Compare that with Bill Clinton, whose strategy explicitly was to place himself midway between liberals and conservatives