Adjectival form of "advocate"?

What's a good adjective that means something similar to "advocate"? For instance, "He is an advocate. He's _____."

Proactive and practical are not quite the right sense -- proactive ignores the spokesman aspect, and practical ignores the vocal aspect.

Does English have any adjectives that express the same idea as "advocate"?

Solution 1:

Advocatory should be good enough for an adjective. Meaning does say 'characteristic of an advocate'.

According to Dictionary.com the adj form for Advocate is Advocative.

advocate
RELATED FORMS
ad·vo·ca·tive , adjective
ad·vo·ca·tor , noun
non·ad·vo·cate , noun
pre·ad·vo·cate , noun