A public man in a private eye -- or how the U.P. reporter (at the White House since 1941) views Mr. President. Following him for half his campaign, in attendance from Korea to Colorado, Georgia and California, Bermuda, Canada and Mexico, Smith is also on hand for golf, fishing, cooking -- and at work. So -- from the fringes of the official family comes this candid camera-ing -- which, if once in a while in soft focus, is also often very sharp, and which attempts, in spite of obligatory distortion, a balanced personal (not political) picture. Within the medium of his media are these reports on , Mamie, their national and household life; unpublicized interests and characteristics; the new home in Gettysburg; the grandchildren; religion; the people that make up the presidential working team; the chances of candidacy in 1956. A marker at the halfway point, this is not an achievement record but a close pen portrait in popular terms.