Fascinating interactive graphs at the excellent http://fivethirtyeight.com (Nate Silver) comparing the popularity of trump with all the other US presidents since Truman. I had to shrink the view down to 65% in order to include all the presidents on the screen capture below, which makes it hard to read, but if you want to look at the graphs in details, just click on the link below and chose chose the time frame that you like between 117 days (trump's presidency so far) and 8 years. trump's line is the little green one that starts at around 45% and keeps plunging. He is presently at 40% but many serious pollsters put him closer to 36%. What is interesting is the downward trend: No other president stayed that low during the presidential "honey moon".

But if we forget trump for a moment, it's interesting to see how the public rated the other presidents. Some curves are scary like W who went down in a straight line after 9/11. Overall, Obama, Clinton and Eisenhower did well. Kennedy was very high. Nixon was doing OK before Watergate.