Audio Blog: What are the two commonalities of falling GOP hopefuls?

Below chart shows how the RCP Poll averages changed from point where Donald Trump first appeared in RCP Averages, and 3 Sep 15. The biggest losers are Bush, Paul, and Walker, while the biggest gainers are Trump, Carson and Fiorina, while Kasich inched up.

Second Chart below shows the same information as a % change, gainers in green. Is there is a lesson to be learned in these poll movements that GOP Hopefuls must learn?

RCP Poll Averages Comparing 28 May 15 (First Time Trump Included) with 3 Sep 15

RCP Poll Averages: % Change Since Trump’s First RCP Poll Appearance vs 3 Sep 15