Lincoln was elected during a very turbulent time, when disagreement on important issues (issues that would decide the fate/character/future of the nation) were the subject of open debate.
I think that if a person like him could be elected at that time, speaking his mind on those issues and maintaining his positions on them to a laudable degree, he could do it today.
It's not too much to ask that our leaders be men and women of integrity. The "reality of our political situation" can be changed and changed quickly. That kind of change might not seem likely, it might not be likely, yet it is certainly possible. And the more we collectively believe in this possibility the more likely it becomes.