Because many people remembered a time when the Republican Party was not so extreme, and hadn't full grasped how much it had changed, people blamed Obama for his failure to get Republicans to agree with him. That blame coloured so much of how the public saw Obama during his presidency. The public thought he was dealing with a brand of Republican leader that just didn't exist any more.
Jonathan ChaitIn some ways, Trump is just going to continue the trend: by continuing the norm-smashing behaviour that Republicans used in opposition.
Jonathan ChaitObama took 20 million people from the category of ignorables and put them into the category of unignorables. No one had to do anything for these 20 million people because they were outside the system. Now they're inside the system. Taking away their health care imposes all kind of political pain. We don't know the outcome, but every passing day it show how difficult it is for Trump to deprive them of what they now have.
Jonathan Chait