The Constitution says nothing specific about journalism specifically. It regards only speech and the press, of which journalism is a subset. Publishing, alone, is surely protected.
"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."
This makes the clear assumption the first amendment is an unlimited protection which it isn’t. I would suggest reading the opinions of Oliver Wendell Holmes.
"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."