Because he’s "dizzy."
Also revealed: He has occasional momentary episodes of dizziness, when he gets up suddenly. McCain first told a doctor about them in 2000 — a visit that also uncovered the melanoma — and intense testing concluded they were harmless vertigo. He didn’t report any episodes at his most recent exam.
So I guess in the McCain family, not only is John not the breadwinner of the family, but in spite of the fact that he has a beautiful blonde wife, he’s the dizzy one.