i 'm well aware that i have neither the imagination nor the intellectual capacities of a jefferson , either of the adams , a madison , a lincoln , a wilson , a hoover - yes , i said hoover , that brilliant , much maligned man - or an f.d.r. , a truman , a nixon - yes , nixon , whose flaw was in his character , not in his geopolitical overview - or a kennedy , or even the brilliant carter , who had too many brain cells for his own good politically .