It may just be me, but Marjoe Gortner comes to mind.
The speaking style-half sermon, half lecture.
https://en.wikipedia.org/wiki/Marjoe_Gortner
SPOT ON !
I am VERY familiar with Gortner and that's a great comparison. In fact, I've been thinking of Gortner a lot when contemplating Cruz's antics. Interesting that I wasn't the only one.