Last night Ted Cruz spoke to a largely indifferent New York audience at a state GOP fundraiser that took place in a storied hotel once owned and refurbished by Donald Trump. Likely far worse than speaking to a gathering of people who, according to various reports, merely talked over the Republican Senator, was a brand new Fox News poll that showed Mr. Cruz’s national support dropping by double-digits as GOP rival Donald Trump surged to all time highs in support among Republican voters. Is the still-ongoing Colorado primary scandal to blame for Mr. Cruz’s sudden collapse? A drop of 11-points...