Governor Eliot Spitzer (D-NY) / HUD Secretary Julián Castro (D-TX)
Businessman Donald Trump (R-NY) / Governor Mike Pence (R-IN) ✓
Can confidently say he would be a weak candidate against Trump.
What makes you believe he would have been so weak, even without the prostitution scandal?
Easy to stereotype as a coastal elitist, little name recognition, damaging primary fight with Clinton and Sanders, most of his accomplishments would be controversial nationally, like issuing an executive order directing that state offices allow illegal immigrants to be issued driver's licenses. Not to mention Troopergate, where he used state police for surveillance.