LOL at idea of Reagan being partisan.
The reason he got most of his agenda passed his because he worked with Democrats to get them passed
This. Plus, for Obama, it's very difficult to be a bipartisan President when the other side (GOP controlled House after 2010 and Senate after 2014) is hellbent on obstructing your legislation and doesn't really have much interest in reach a compromise.
Now before anyone jumps on me, we are seeing the same thing right now with Trump, and I only expect it to ramp up if the Democrats gain the House or possibly the Senate this fall. Neither Obama or Trump one of them will go down as being bipartisan - although I think Obama could have been way more partisan if he told Republicans to go screw in 2009 and 2010 when Democrats had 60 seats in the Senate and around an 80 seat advantage in the House. They got a lot of things passed without Republican votes but they could have gone further in the liberal policies they sought.