You have to read DT VII for Bush-bashing, but it is mild and tolerable.
This series was clearly a spiderweb of ideas that never really fit together and he ends up with this conglomeration of the "Many worlds, put myself in the story, wash away the myriad of continuity errors with 'the world has moved on,' get DT freaks to read the other books, and 'why the hell did I ever even start this project."
It is a free-association story. Like free association, the story is frequently interesting and has some fabulous imagery, but the majority of it makes little sense. If the psych said "apple" and King responded "paper clip", then wrote about the transcendent connection that exists where apple and paper clip are tools in a cosmic battle of good and evil with the entire universe at stake, this is what you end up with.
In the end, you have to enjoy the often riveting scenes and chuck the rest like a sweet melon with a 7 inch thick rind.
At least that woman who helped Roland and Jake was a Gore-hating Republican, and she was written very sympathetically. I did wonder if King having her cheat on her husband was some little comment on conservative hypocrisy (ie, the left's idea of what Clinton/Lewinsky was about), but I think that falls under "reading too much into it." Also, it was interesting when Susannah mused that she might be turning into a Republican for feeling good about being tired from a long day of hard work.
The little bit about Gary Hart was kind of stupid (being vague for those who haven't read the book), but the series was mostly free of politics.
I don't think King likes Bush.