During MSNBC’s 11 a.m. ET hour on Monday, minutes before Barack Obama began his first public appearance since leaving office, correspondent Ron Allen channeled left-wing hopes that the former president would emerge as the “opposition leader” to President Trump. While Allen noted that Obama was “not going to take on President Trump directly” during the panel discussion at the University of Chicago, he claimed that it was “a very unusual situation”: “You have a very popular former president who’s just 55, very vigorous....And you have a president, President Trump, whose administration is so diametrically opposed and is dismantling so many...