[Bob]

I think so but didn’t know for sure. Just be sure you don’t get caught with your participle dangling.

While I’ve been known to occasionally split an infinitive, I’m quite sure that a preposition is a bad thing to end a sentence with. :=)

[Gene Eric]

Actually, I think you're right.

has is defined as the singular present tense of have. So the past participle would be had advocated. But I'm guessing has advocated is no different than advocated. And if only the author wrote advocates, we could have spent our time on perhaps something more absurd such as politics.

FRegards, and goodnight :)