I agree, any restrictions can be harmful. However, it is not like these unlimited terms congressman won't do big things without regard for long term impact. We have an average of 80+% of re-election rate for congressman in the past several decades. VP, House of Reps and Senate can serve unlimited amount of terms (4, 2, 6 year terms respectively). I'm not asking for 2 term limit, I'm asking for reasonable limits. Unfortunately, this will never happen because it has to be an amendment as the SCOTUS said the states does not have the power to limit the terms: http://www.wikiwand.com/en/U.S._Term_Limits,_Inc._v._Thornton
Obama marketed very well, the "Yes, We Can" posters were all over the place and the youth were involved in getting votes for him. I do remember people getting involved in the first election, the second election, most people just didn't care. I have not seen anything from Sanders that tells me differently. Nobody in my family knows who he is or what he've done so far.
We have candidates in the last two elections with much better and consistent voting records and they still didn't win. Sanders isn't well known either, sorry but nobody knew who he was when I talked about him. Obama, everyone knew and that had to do with how fresh he was. Sanders is your typical looking white old politician that just happens to have the same harmony with the majority of the Americans, which really doesn't change anything. I know that the looks shouldn't matter, the voting records should matter, and so on but a few studies have shown that people do consider the looks more than the records. Even if Sanders win, what can he do that the GOP can't block or interfere with for the next 4 years that they've done to Obama. Sanders isn't a magical cure. He cannot undo the decades worth of lobbyist efforts, corruption, and so in the Congress that will continue to be the biggest problem we have. Like you said, what politicians says often turns out something they didn't do. There's no evidence you can give me that ensures that once he is elected, he would do what he said. All we're seeing is marketing, that's it. Marketing is what Obama did very very well.
I became so jaded that it just doesn't matter who becomes the president. The problem isn't picking the best president but rather, voting for the right congressman that actually cares for the people rather the corporate world and lobbyists. We need to set a lot of term limits including an age limit for the US Congress. We need more diversity, younger, and smarter people in the Congress doing the right things that Sanders want to do. Sanders could be the next FDR but not as long as we have this messed up Congress that votes for money rather than the things we need. Sanders is just being hyped up like Obama was and look how that turns out.