Possibly the Carson numbers are actually being elevated by the truly “undecided”.
Carson is harmless and is Dr. Nice, at a time when people need to be soothed, perhaps to sleep, and also it is still early.
Maybe they are aghast at the boldness of Trump and suffer from general unease with anyone else being capable of actually winning against Trump, or any Democrat in the general election?
You’re probably right, except I wouldn’t label Carson as harmless - his amnesty plan and love for illegal aliens is harmful to us all.