This. I'm not too concerned for his safety considering the Secret Service, but I do think a popular vote loss/EV win could lead to violence. Remember, there are plenty of congressmen and senators who don't have any protection.
No one should be rooting for a repeat of 2000, even if the EV results are more definitive/clear (say, Obama winning by Ohio and Colorado's electoral votes) than Bush's. It would harm the country and people would get hurt. We've seen republicans attempt to tear Obama down for four years, even if doing so hurt the country economically or in terms of general partisanship. They don't give a shit about anything but winning and consolidating power.
I think there will be a large, loud, and very ugly reaction regardless of how Obama wins - whether it be a small victory or large. The right has convinced themselves for years that Obama is the worst president ever, and clearly voters would cast him out. What will they do when there are no longer any electoral means of getting rid of him? I'm going to have some fun watching Fox if Obama wins, and seeing various twitter/facebook meltdowns, but that's as far as I'll go. There are a lot of people on the far right who are well beyond any logical level of reality, and they will not be happy as they watch Fox harp on Gallup polls showing Romney ahead, but Obama still winning.
I think this is the effect of internet comments, it makes the nation seem more polarized than it is. There are people on the conservative sites talking about how nuts Democrats are going to go when Obama loses. I think everything will be fine. I am not rooting for just an electoral college victory but it is nice to know that President Obama could get his victory without winning the popular vote. Besides even in scenarios where President Obama wins the electoral college but loses the popular vote he would essentially need to have 50 percent of the votes.