According to my research, Paula Deen just blowdries, round brushes, and finger styles with styling wax to achieve her "edgy" look.
As for Anderson Cooper, I am going to guess that he would have a similar regimen followed by a hair polisher.
The answer is: the electric curling iron with an adjustable temperature gauge. Why? Over the years, I have found that even after testing the conventional marcel curling irons before using them to curl the hair, some white/gray hair that is finer is subject to discolor slightly. Medium to coarse gray hair does not make as much of a difference, but to be on the safe side, I suggest grabbing the electric curling iron with adjustable temperature control set to low to medium in order to keep white hair white.
A constant temperature from the electric curling iron takes the guesswork out of curling finer hair. Just start at a medium to low temperature and work your way up as needed whether you are working with grey hair or not.
Example of both finishes: Conventional stove and marcel iron versus Electric curling iron.
Hair by Benita Blocker (above, conventional marcel curling iron finish)
Hair by Benita Blocker (below, electric curling iron finish)