Image 02 (Note: the character in question was indeed a US President. The picture does not reflect that fact)
Ken Kercheval/Dallas [In the final episode of Dallas, we learn that because JR was never born, Cliff became VP, ascended to the Presidency and did a pretty good job]. (edited at 7:17 am, September 22, 2015 (PDT))
Original Answer: Ken Kercheval/Dallas/Cliff Barnes [In the final episode of Dallas, we learn that because JR was never born, Cliff became VP, ascended to the Presidency and did a pretty good job].