They had no need to. He reported them above board and openly in his monthly disclosure forms. He earned his income as a private citizen. On the other hand, she has only been a senator earning less than $200k. She is a public servant, as is McCain, and should have more scrutiny.
Their book deals and his speaking income have never been a secret and have netted them millions over the last few years.
Why is no one pushing McCain to release his tax returns?