Is it advisable to influence the US Embassy or Consulate through recommendations by politically or administratively important persons?
No. Visa decision cannot be influenced by anyone, however high and mighty he or she may be. On the contrary, trying to bring such influence may even jeopardize your getting the Visa on your merits. Do not be taken in by any “consultant” or tout who claims that he has influence over the US Embassy or Consulate and can obtain the Visa for you.