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"Maybe now liberals think the U.S. should have signed the Kyoto Protocol, and that Bush's refusal to sign it was a big mistake. I think a lot of liberals believe that, but no Democrats in the Senate supported U.S. ratification of the Kyoto Protocol. A reasonable view is that it was a terrible idea for the United States."
The reasonable view is that the Democrats of the Senate are politicians. They want to hold onto their seats. So, while the Kyoto Protocol would be good for the US, they were afraid to implement it because it would be hard for a while. Putting the Kyoto Protocol into effect would be very unpopular, and Senators need to be popular enough to be reelected.
Here is the problem with such a writer. He is convinced that Obama is a great guy. But lots of people were convinced that Bush was a great guy. Bush appeared moderate during his first campaign, but he didn't turn out to be moderate. In a way, the ideas this author cites as being a bad thing are traps he has fallen into. A group of like minded individuals become more liberal or conservative in discussions. But, this guy is too close to Obama to make an objective determination. Unfortunately, I doubt that he would admit to the case.