Johnson decides not to run nixon resigns presidency bush defeated by clinton based on these headlines a valid conclusion about the presidency since the 1960's is that

The valid conclusion about these political phenomena could be that the very strong anti-Vietnam war movement of the American and world's people definitely had an impact on Johnson not running and also somewhat on Nixon (as well as Watergate) and there may have been a backlash against the war mongering of George HW Bush in Iraq and also the brutal invasion of Panama.