It's on his Wiki, though it's a paraphrase and not a direct quote... I don't have access to the World to pull the quote, but you might. I would add, it wasn't like he was being effusive or anything. To a person who pays attention to the history of the time and place he's referring to and aware of its relation to his particular family history, it's just a bit tone-deaf.
In a 2013 interview before running for office, Drummond described his politics as aligning with the "business class ... which translates to mean that there is a little Republican and a little Democrat in everyone" and noted the importance of the Democratic Party in helping Oklahoma in the 1920s and 1930s, and he also noted the prosperity brought by the Republican Party in the 1980s and 1990s.[4]
I do somewhat agree that the Dems (nationally) did quite a bit in the 20's and 30's due to FDR and the Great Depression.... but specifically in Oklahoma during that time, that wing of the Democratic Party wasn't a highlight of civil rights... and Gentner's family profited off of some of the Democrats' flawed history in that generation. They bought William Hale's ranch when he was convicted for the Osage Murders. Hale was a bigtime Democratic influential in Oklahoma in the 20's. For example: Hale's defense attorney in his Murder Cases was a Democratic former Oklahoma AG (Sargent Prentiss Freeling
)
I may generally support the DNC these days.... but the DNC of those days in Oklahoma was pretty backwards aside from their support of the progressive labor movement.
If I was going to be effusive about a time period for the DNC probably be in the mid 30's / 40's and then again in the Civil Rights movements of the 60's (if we can ignore Vietnam). They did make some limited steps in the right direction with the labor movements and leadership through WWI under Wilson, but there were still so many racist Jacksonian / Confederate hold overs at that time (not excluding Wilson himself) that the period is largely tainted.