Mike Gravel is a candidate with lots of experience in politics as an ex-senator from Alaska. He even tried to get nominated as a vice-presidential candidate earlier in his career.
I heartily endorse Mike Gravel as a candidate for President, with the hope that he might help to keep the discussion from becoming stale. Realistically, he has no chance of getting on the ballot. There are two reasons for this: first, he's from Alaska which only has 3 electoral votes; second, he is 76 years old. By the time he could get elected he would be 78. To put that in perspective - Ronald Reagan was our oldest president and he was 77 when he finished his second term. Mike Gravel would be 78 before he started his first term and would be
8082 (I got lazy - as noted in the comments) before his term ended. We will never have an octogenarian as President unless half the population of the United States is over 50.