Just in from Pew Research:
When asked which president has done the best job in their lifetimes, more Americans name Barack Obama than any other president. More than four-in-ten (44%) say Obama is the best or second best president of their lifetimes, compared with about a third who mention Bill Clinton (33%) or Ronald Reagan (32%).
Which president has done the best job during your lifetime?Not yet halfway through his term, 19% say Donald Trump has done the best or second best job of any president of their lifetimes. That is comparable with the share who viewed Obama as one of the best presidents in 2011 (20%).
About one-in-ten adults (12%) say John F. Kennedy did the best job in office during their lifetimes. But Kennedy is named as the best or second best president by about a quarter of those who were alive during his presidency: 24% of Baby Boomers and 25% of those in the Silent Generation.