It makes sense that McCain telling truths would make Republicans more uncomfortable than Obama doing so would make Democrats. The dominant Republican positions on global warming, immigration (the examples given, and I would add the war and tax policy) are all based on complete misconceptions about objective facts and the way the world works. The consensus opinion of the scientific profession is after all worth something on global warming. Most immigrants are just people looking for the American dream, not evil terrorists.

While there are certainly some widespread beliefs on the left which aren't entirely defensible (we don't all have policy degrees, after all), they don't come close to the ideological centrality of blatant untruths to the current Republican Party.

The relevant measure is not how uncomfortable Senators Obama and McCain are making their crowds, but how truthful they are being.

While there are certainly some widespread beliefs on the left which aren't entirely defensible (we don't all have policy degrees, after all), they don't come close to the ideological centrality of blatant untruths to the current Republican Party.

I appreciate that you don't try to contain your bias as you state opinion as fact, but this it complete nonsense. If you believe there is a consensus on human influence over global warming, you:

a) don't know what the word "consensus" means.
b) only bother to read information that reinforces your existing opinions
c) both

Shouting the loudest does not give you a consensus. What's more, if you think that just one side of the political spectrum is bad, and your side is good, you're part of the problem. Both sides use the same shameful political tactics to accomplish their ends. The only difference between the two is what those ends are, and their success rates.