"If we already know GOP policies don't help the economy, why should we vote for a GOP candidate?
We shouldn't, clearly.
The republican candidates are wrong on most – if not all – the issues.
And republicans are not only wrong concerning the economy, but they're wrong on social issues and regulatory policy as well.
The problem isn't republicans per se, but the extremists and blind ideologues who have misappropriated the GOP – there was a time when a majority of republicans were interested in sound, responsible governance and public policy, before the advent of the bane of the social right, the TPM, and libertarian reactionaries.