Winston Churchill was in line to be Duke until one of them married a Vanderbilt, had an heir and spare, and then that person became Duke. So yeah, a Duke would be eligible if Cruz is providing they did the residency requirement.
Christie calls Obamaa petulant child! LOL
Sorry but I think I know. a bit of this...WC was never in line to the Dukedom...
WC was the elder son of a younger son who’s elder brother was very healthy....