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I was about to ask a question but I can't without first confirming,
Is this sentence:
彼は映画スターであり、政治家もだ。
grammatically correct, and mean:
He is a movie star and also a politician.
==
Follow-up question here: Why does replacing だ to である changes the meaning of a the sentence?
Recall that だ is the contracted form of である.で has to be attached to a noun. You can't leave it behind も as もである. So the correct way of inserting も will be:
彼は政治家でもある
You might be wondering whether で before も can be omitted. Only arguments can have the (case) particle omitted before は or も. In this case, the noun 政治家 is a predicate, so you cannot omit で before も.
僕もだ, 僕 is an argument, so there is an omitted case particle before も, and the predicate after 僕も is omitted.
I can't comment in the comment section since I just joined, but the usual way of saying this would probably be 「映画スターだけではなく or だけじゃなくて、政治家もしている」. People often use 「する」 to talk about jobs. Also, 「であり」 is formal written style and would sound strange in conversation.
Sounds odd. How about:
彼は俳優で、また政治家でもある。
Yeah, I don't like the word 映画スター too much.
