Winston was NEVER a DUKE OF MARLBOROUGH.
His father, Randolph was the YOUNGER son, his elder brother was the Duke.
I have never said Churchill was the Duke. He was presumptive heir for more than two decades. The 10th Duke was a Vanderbilt. He was eligible to run as POTUS if Cruz can run.
Btw,Churchill was offered a Dukedom.The point still remains...had he accepted it - he would have been eligible to run as a Duke