Yes, Cox has never run for public office. But that doesn't mean he will be a formidable candidate in the Republican primary. I suspect he will get a lot of support from the RINO establishment. I wouldn't write him off just yet.
Yonkers isn't really that heavily a Democrat city. Most of its local officials currently are and recently have been Republicans. A lot of the residents are Reagan Democrats.
He will be = he won't be.
I must proofread better and not use double negatives.