Stephen Collinson at CNN:
Just as Barack Obama was warning that America is in the grip of a politics of fear that undermines norms and political accountability, President Donald Trump was unleashing his latest assault on traditions of governance that underpin the nation's democracy.
"These are extraordinary times. Dangerous times," Obama warned in an extraordinary indictment of the behavior of a successor to whom he handed power in January 2017 and who has torn at the conventions that restrain presidents ever since.
It was a revealing moment in an enthralling clash of philosophy, temperament and style that unfolded Friday between a current and former president who epitomize opposing currents in an epochal political moment and are now in direct conflict ahead of the midterm elections.Trump's latest Gallup approval rating is 41 percent.
In February, Gallup reported that President Obama's retrospective approval rating is 63 percent.