The reason present day United Stater Liberals and Conservatives have such vitriol for each other is as Hayek wrote;
"They competed for the support of the same type of mind and reserved for each other the hatred of the heretic. But their practice showed how closely they are related."
And to paraphrase "...to the Liberal the Conservative, and to the Conservative the Liberal are potential recruits who are made of the right timber, although they have listened to false prophets, they both know that there can be no compromise between them and those who really believe in individual freedom." ~ F.A. Hayek, The Road to Serfdom, 34.
This election cycle has raised up a messiah for each side. To never been questioned and to be defended with the most violent hate and rage. Amplified and exacerbated by the hounds...
Is there a difference between Our Choices this year? Maybe.
But, both candidates voted yea on the Bailout of rescue socialism for the powerful. Neither candidate plans on reducing the Imperial American Military presence across the globe. And trillions will still be funneled to the MIC. On a Macro scale there really is no difference. It's the latest battle in the War of the Roses. Your choice is which Feudal Lord do you wish to bow down to and pay homage.
However, it maybe on the micro picture a president Obama or a president McCain will mean different things for individual families. I for one dislike McCain's Capital Gains tax plan, his Warmonger status and Palin's endtimes religious zealotry.
Vote for whomever you feel like and be prepared to be cursed for your Heresy by the other side.
Seems like this is a common thought reverbarating around the internet. Here is a post from the Volokh Conspiracy about the [Insert Name] Derangment Syndrome covering a similar theme as my essay.
Andrew Sullivan touches on the election Anger here.