I wish I could see things that way. Unfortunately, I see waaaay too many differences between Dems and Republicans that I just can't join hands and say "we're in this together." From the moment President Obama took office, there was a concerted and consistent effort to make sure he failed. Every. Single. Issue that Obama took up met near universal stonewalling from Republicans.
After 9/11 there was a period of time where Democrats did put aside partisan differences to make sure our country was safe. When President Obama took office, the entire world's economy was in tailspin and Republicans' actions in Congress seemed to convey that it was in their interest to make sure Obama did not get his way-- everyone else be damned.
When you add in things like the "birthers", Congressmen yelling at the President during a joint session of Congress, consistently insinuating that the President just "isn't like us"-- it's clear that Republicans at best have no respect for the man holding office, and at their worst are allowing a racist element into their party's dialogue.
I don't even have to contemplate who I'm voting for. The choice has has been made abundantly clear over the past 3 years.