So publicly tweeting out polling data is illegal?
I think the part where they encoded the data so that it wasn't really made available to the public is illegal, but I'm not really sure.
Maybe it isn't really encoded to someone familiar with polling data?
I saw an article that gave an example of a tweet. It was something like this: 12/20, 38/42, 50/21, etc.
If you were familiar with polling data, knew what order, where, and what the numbers indicated, then yes, you could easily decode it.