nonstarter

This plan has the virtue of relative simplicity, but is considered a nonstarter with Republicans.

End the tax-free status of employer health benefits:  So many problems with this, I think we can all agree it's a nonstarter.

I know, at this point, that the first option is a nonstarter.

But Mitt Romney for president is a nonstarter, despite headquartering his campaign in the North End of Boston.

Yet even before the document became public, Republicans called it a nonstarter and dead on arrival.