Unless you're a rich white guy, you are only elected because you aren't someone else...
Or so it's always claimed.
Obama won because people didn't want Clinton. Or, Clinton will only win because she isn't (insert competitor). These kind of arguments originate on the right and migrate over to the "left."
They, at their core, are motivated by a need to marginalize abject populations and beat them down when they reach for the top. You are removing their agency and handing it to someone else. Which isn't terribly surprising because we do that to oppressed populations all the time in myriad of ways.
I don't like Obama that much after 5 full years of his presidency. I disagree deeply with many of his policies. But, in 2008, I voted for him because he was intelligent, accomplished and progressive. Not because I didn't want Hillary Clinton to be president. And that, at the very least, is an accomplishment for which President Obama should be recognized. And, if Hillary Clinton wins the presidency in 2016, we should be recognizing her accomplishment as well.