The medium is...well, you know... I'm a McLuhanist, attuned to the effects of media on culture and history.  Look closely and you'll easily find that major changes occur with the embrace of new technologies...all the way back to the creation of the alphabet and even earlier.  Roosevelt's embrace of the new medium of radio permitted direct communication from the president to the public.  This is echoed in Trump's use of the new media, specifically Twitter, to bypass the old media of print, radio and TV. The first use of an electronic medium by POTUS was Lincoln's embrace of the telegraph--the new medium of his day.