It's nothing like Obama. Obama was fairly unknown. He didn't have much of a record. All we could go on is what he said. What he said ended up being very different from what he actually did. Sanders has been around a long time. His record shows that he does care, and that he is who he says he is.
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.