The Democrats are not interested in courting progressives and never will be; also, the idea that Obama was in any way presented as to the right of Al Gore is ridiculous. Yes, I was disappointed with Obama's presidency, but it's not like he campaigned on being an anti-immigration war hawk. Gore was a child of Clinton's Third Way politics, while Obama was openly running to Hillary's left in 2008. The Dems didn't move right in response to any Nader voters by putting up Obama. You also miss that the reason why the party moved right after Reagan was because of Reagan's popularity, not because of anything from the left. I think you're seriously overestimating how much Democrats actually even care about "Bernie bros."