Regarding Clinton vs. Obama, one could blame Clinton for the start of this. That is, right-wing lunacy seen today by the GOP in DC. By adopting what is now known as moderate stances on positions, he embraced many of the then-right wing positions GOPers were championing at the time and left Republicans with NOTHING to work with. One could argue it was smart at the time because it gave Clinton a sense of ownership in setting the tone for what would be legislated, but I think they severely underestimated the future implications of such a tactic at the time; Clinton honestly helped move the GOP further to the right to compete with Democrats who were beating them at their own game.
Then Bush got elected after an extremely close, polarizing and wildly contested (to this day) election in 2000, 9/11 happened, we got bogged down in two unnecessary wars, the SCOTUS was solidified as a right-leaning court, the economy had been a bi-polar mess, then it crashed, we're on a slow but steady 'recovery' that is changing the face of how people work, and things just keep getting more and more cut-throat. It is an abyss and we're never going to recover, not for another generation at least, but not until the GOP can exhaust every last measure preventing us from getting there which just buys them more and more time. And there are real and lasting implications such as SCOTUS rulings on everything from campaign finance to the voting rights of minorities that should worry every American who isn't a right-wing loon.
Obama being a biracial President probably didn't help fan the flames of the teabagger crowd over the past 5 years, but it wasn't the only thing.
I think we're right at the brink of, for all intents and purposes, turning into a plutocracy. We're practically there. That isn't what this country was about, but the GOP is rewriting history with every law and court ruling that passes/is upheld in their favor. It is 'bad news', for real.
Again, if the GOP takes the Senate there is going to not only be a huge push from the party internally, but all the Koch-funded and similar special interest groups ejaculating their money and influence over Washington on a daily basis, to impeach Obama or at least send bills his way every month that seek to roll back every inch of progress he's been able to achieve as President. It's going to be a fucking war.
If Hillary doesn't win in 2016 'doomed' won't be such a joke word around here.