With influence comes power, with power comes politics and with politics comes supporters. The large majority of Wastelanders would give a willing eye just to follow someone who they feel could lead them to some semblance of order. To this end, they would be willing to exert their chosen leader's influence far and wide to prove their beliefs right. Using these willing pawns will secure your empire a strong force of followers that can and will operate on your behalf only. Just be aware that there are those who will choose to go against you....