CARTER OPENS DRIVE BY DENOUNCING FORD AS TIMID PRESIDENT
Jimmy Carter formally opens his Pres campaign by portraying himself as repr of 'new generation of leadership' and Pres Ford as timid and ineffectual, speech, Sept 6, Warm Springs, Ga; sees himself as pol heir to Franklin D Roosevelt and John F Kennedy, but different in that he is 'farm boy' with roots in working and middle-class Amer; cites scandals and irregularities in various Fed programs and agencies; says no one seems to be in charge or taking responsibility; pledges 'tough mgt and careful planning leading to balanced budget'; visits Southern 500 stock car race, Darlington, SC; flies to Norfolk, Va for rally and fundraiser, then on to NYC; Carter illus in Warm Springs; Carter family illus (L)