Ralph Nader officially threw his hat in the presidential campaign on Meet The Press yesterday. Most of you remember the horrific 2004 election, when Nader caught heat for sapping Democratic votes from John Kerry. Nader's certainly aware of those critiques, but insists that his candidacy should not spell doom for the Democrats. And, if it does, that's their problem: "if Democrats can't landslide the Republicans this year, they ought to just wrap up, close down, emerge in a different form." Democratic front runner Barack Obama doesn't seem to agree, saying: "…His function as a perennial candidate is not putting food on the table of workers." Obama also had harsh words for Nader's 2000 comparison of George W. Bush and Al Gore: "Eight years later, people realize that Ralph did not know what he was talking about.” Yes, but if Nader hasn't learned his lesson, we have a feeling a lot of his historical supporters haven't either…