Here is what I have found in Crash Course US history at 13 minute and 4 second, and it really confused me.
Whereas if you are an american arguably the most important thing the leader of this era ever did was raise George W Bush.
The reason I am baffled is that the parts of the sentence don't seem to me to agree. Would it be more grammatical if said:
...ever did was raising...
...ever did was raised...?