Carson got those elect-ability skills I see. And Paul went from best polling Republican to worst polling Republican. What the hell happened?
The three way race is something that's a bit weird. A good chunk of Trump's supporters come from disaffected independents, not Republicans. So it splits Republicans but it also splits independents.
The Republican Party has typically won the plurality of the disaffected vote. Donald Trump could appeal to those who think that we are better off with a businessman as President than with a 'mere' politician.
It's hard to imagine any Democratic nominee losing more potential votes to Donald Trump than the Republican nominee does.