You can't prove it by his record. Not even a little bit.
I dare you to examine Romney's record in office and find a single thing you can point to, that would back up your assertion that he'd be "better than Zero".
Can't be done, because Mitt is a complete fraud, and an utter liberal, as PROVEN by his record.
In all our years fighting this mindset Windy, not a single person ever answers that challenge. Because it cannot be answered factually without us being shown to be 100% correct.
I don’t think Mitt’s record informs for many of the issues here. It is beyond question in my mind that Mitt would be far better on nation defense, the economy, the border, Supreme Court, spending etc. Sadly there is no way to know with certainty. My conjecture is as viable as yours.