Definitely an infringement.
Is it possible that Ron Paul acknowledges the 14th but interprets it differently? What are these vague "privileges or immunities of the United States"? Maybe he thinks it was written to prevent states from ever again subjugating a race or a class of people. Its vague enough to be interpreted different ways by people who hold equal respect for the constitution.
No, it's really not that vague at all.
See Corfield. v Coryell and Dredd Scott v. Sanford for an explanation of what privilege and immunities means.
That clause was among other things, a Constitutional smackdown of the Dredd Scott decision, which is why Bingham chose those words specifically. Taney repeatedly listed all the "privileges and immunities" that blacks couldn't have:
Scott v. Sandford" For if they were so received, and entitled to the privileges and immunities of citizens, it would exempt them from the operation of the special laws and from the police [p417] regulations which they considered to be necessary for their own safety. It would give to persons of the negro race, who were recognised as citizens in any one State of the Union, the right to enter every other State whenever they pleased, singly or in companies, without pass or passport, and without obstruction, to sojourn there as long as they pleased, to go where they pleased at every hour of the day or night without molestation, unless they committed some violation of law for which a white man would be punished; and it would give them the full liberty of speech in public and in private upon all subjects upon which its own citizens might speak; to hold public meetings upon political affairs, and to keep and carry arms wherever they went. And all of this would be done in the face of the subject race of the same color, both free and slaves, and inevitably producing discontent and insubordination among them, and endangering the peace and safety of the State."
Everyone knew what privileges and immunities meant at the time. Just because people have become more ignorant doesn't mean we get to completely ignore an entire section of the Constitution.