All he ever mentions is "overturning Citizens United", which Hillary Clinton, Barack Obama, and every mainstream Democrat are also on record vehemently supporting.

How do you do it? Nobody's gonna amend the Constitution over something like this. So all you can do is try to change the makeup of the Supreme Court, and leave it to them. Barack Obama has already nominated someone who would shift the balance of the court. Hillary would either stick with him or choose someone younger and/or to the left of him. Bernie would do the same.

They have identical positions on campaign finance reform.