Sorry to disturb you great teacher.

What good does it do the ticket for Rubio to be popular with whites and Cuban-Americans? (original)
Question: Is the original grammatically correct?
the adjective "good" = ?
the verb "do" =?
What is the exact meaning of the original?

Question

Sorry to disturb you great teacher.

What good does it do the ticket for Rubio to be popular with whites and Cuban-Americans? (original)
Question: Is the original grammatically correct? 
the adjective "good" = ? 
the verb "do" =?
What is the exact meaning of the original?

Answer

Taking away the word "what" that turns it into a question, the basic sentence is
"It does do good".
subject = "it"
verb = "does do"
direct object and NOUN: "good"

When you turn it into a question, the object becomes "what good", with "what" being an interrogative specifier.

Answer

Meaning :

If Rubio is popular with whites and Cuban-Americans, how will this be an advantage to the group of political candidates of which he is a part?

Answer

- "good" = advantage/ benefit/ positive outcome

- "do" = contribute to