I suspect that the main perspective is that of an unnamed senior Democrat, who really does not buy the importance of doing this now.
In terms of what Kerry is doing:
Kerry said that he’s following direction from Democratic leaders and other senators who wanted him to meet with industry representatives and other groups from across the country."
(short summary - he has worked like Hell on this and has reached out to everyone.)
I think Rockefeller and Kerry actually like each other - at least from interactions in the Finance and Commerce committee. Reading this, the ONLY reason pricing carbon did not die a year ago is Kerry.
Rockefeller refers to Kerry's method as similar to be courted. Kerry is trying to win people over. The analogy would suggest that he is being both persistent and nice. In fact, that is the only way that would stand a chance of working here. Kerry is asking people, like Rockefeller, to make a possibly career ending statesman vote putting themselves on the right side of history. Kerry's persistence and his use of reason would make it hard for those who know that they will pay a price for the vote but who hear and believe Kerry's words on the planet.
What you hear from others named in the article - are mostly positives.
Conrad and Beiglish praised him for reaching out to their constituents. Graham spoke of never seeing anyone as committed on an issue - and think of all the people that Graham has worked with. His comment that Kerry's willingess to sit down with Pickens speaking volumes about him as a person was clearly high praise. In a documentary on McCain/Kennedy, Graham had an almost Kerryist way of speaking about how what they did had to mean something - policy over politics. I would not be surprised that if Kerry managed to get 59 - Graham would return - doing the right thing knowing his political career would end January 2015.
Reid is described as "impressed".
Durbin is described as fearing it will hit a brick wall - which could happen - if it does, nothing has really been lost - they can then go for an energy bill. I suspect that the "senior Democrat" who expressed concern on responding to BP and said "typical Democrat" is likely Schumer. As to nonsense of "popularity" among the Democrats - it is highly unlikely that anyone will vote for or against this because they like or dislike the leader. Levin even contradicts himself after saying Kerry is not the leader on this - suggesting he is the leader of the leaders. I doubt that it is Bingaman's great popularity that makes many prefer his bill, it is that they really don't want to price carbon. (Menedez is being a jerk - trying to make points with the liberals, who actually will never accept him due to other issues.)
Note the implicit assumption that the centrists are the popular people that can make these deals (but Leiberman doesn't count). The fact is that Ted Kennedy did. Also note that Baucus, who can go on for hooouuurrss in the Finance committee thought the presentations too long - but refused to single out Kerry.
The most infuriating thing about the situation is that Kerry is doing what the liberals always say they want a leader to do - fighting hard to gain an elusive but incredibly important goal - yet they are attacking him.