What are other legitimate interpretations, Bob, for the idea that the Constitution is a charter of negative liberties?
You are asking me to offer a critique of Obama's idea about the Constitution — one I happen to share, by the way — as though the comment was a piece of text from the constitution itself. You've confused two layers of reality here. I could comment about Obama's idea, or I could comment about the text, but commenting about the one is not the same as commenting about the other.
The Map is not the territory, to use a line from General Semantics.
About the text itself, Obama is explicit:
President Obama said that the constitution:
Says what the states can’t do to you. Says what the federal government can’t do to you, but it doesn’t say what the federal government or state government must do on your behalf
It doesn't say that it has to be nice to you, for example, or say you're a swell person. It doesn't have to be nice to your spouse or like your in-laws.
In the meantime, the government has taken on a lot of things. It's decided to build roads and sewers for you, for example, and to tax you to pay for them, and you've sent people to congress to push for these things. You've decided that having safe cars and food that doesn't kill you is important, as well as drugs that won't do things to you that they shouldn't do. So now the government does a lot for you and you expect it to, and get upset when it doesn't do it right.
If you want an answer to the question of other interpretations, I did address that in relationship to the second amendment. You can probably do much that same thing with a lot of the areas of text if you have anything like a scholarly understanding of the document, which I do not.
Did you not understand something I said about the Second Amendment, though? I've always thought the text there was fairly slippery. And as for my points about linguistic drift, I think they're fairly straightforward, though perhaps you'd like to ask something more specific that will seriously confuse me. It happens very easily.