> Our left-wing presidents look like our right-wing presidents from 20 years ago in fact.
Not really. Obama's policies are a lot more like Clinton than either Bush (the closest thing to "right-wing presidents" on either side of 20 years ago) -- including doing some of the things the right-wing opposed Clinton's efforts to do or move toward (both domestically, like Health Care Reform, and in foreign policy, like normalizing relations with Cuba.)
> If Reagan or Eisenhower were running they today would be considered extremist left wing communists far too liberal to ever be elected.
Well, modern Republicans might see a candidate with their views that way, though Reagan was pretty significantly to the right of Obama, who manifestly is not "far too liberal to ever be elected".