Who Are the Mystery Republicans?

Suspicion surrounding the backers of the proposal to rewrite the Michigan Constitution now centers on Michigan trial lawyers. They certainly have ample reason to hate the Michigan courts, but their involvement has not been confirmed yet.

There's another question that needs to be asked. From an article in the Oakland Press:

Dianne Byrum, a spokeswoman for Reform Michigan Government Now, said it has bipartisan support.

For something to have bipartisan support, it has to have support from some Republicans. The article doesn't list any Republicans supporting the proposal. Are there any? Who?

Can Diane Byrum name a single Republican supporting it? A RINO, even?