Theres' a big difference between political and non-political speech. All sorts of non-political speech CAN be abridged, trade and national secrets being prime examples. The article talks about non-political speech being abridged, but that doesn't automatically mean poltical speech would be abridged, unless you think the USSC is going to lay down on this issue.
You know, I re-read the first amendment and guess what, the word, implication or even the slightest hint of political simply was not in there. You know what WAS in there though?
Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances.
Then you need to go beyond the Constitution and read some USSC decisions, because all sorts of speech CAN and ARE abridged. Merely citing the 1st Amendment doesn't settle the issue, considering the particular brand of speech in question.