Good luck. I was going to come up with an elaborate analysis, but it would be wasted. A quick analogy: If you write a post explaining why dell is cheaper than apple, given the same components, you will be severely downmodded. Even if apple is better in every other way, pointing out even a single disadvantage is an affront to people who've bought the whole package, even if they've bought that package because of a single detail.
In Obama's case, that single detail might be: 1) Iraq, 2) Net neutrality, 3) Telecom immunity, 4) Anything else.
ADDENDUM: I'm not going to look it up, but the only time I remember pg being dowmmodded severely was when he criticized (rather lamely, in fact) Ron Paul. So, it's not unusual.
It's because you're a bigot.
Please clarify your question.