The form of the argument is that it is denying the antecedent, and it's not deductively valid.
A deductive argument means an argument that is valid such that there is a guarantee about the truth of the conclusion. Denying the antecedent in logic occurs when:
If P then Q,
If not P, then not Q.
Since the statement is “If young people vote enough, their interests are well-represented. But they don’t vote enough. So their interests are not well-represented.”
Therefore, the form of the argument is that it is denying the antecedent, and it's not deductively valid.
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