Cheney and Bush fall into two different categories.
The Vice President reoffended, like the woman in this article, and the President did not reoffend and also did not violate the terms of his probation, like the woman in this article.
The Vice President has since remained clean for 44 years and the President for 31 years.
If the Vice President and President had been busted only four years ago, it would be difficult to say that they had demonstrated a long-term commitment to not driving impaired.
At this point that difficulty is much diminished.
The point is, if you apply your standard, then Bush must have had a pattern of drinking and driving - unless he only drove drunk once in his entire life and he happened to be arrested on the only night he ever drove drunk. That would be among the most incredible coincidences in human history.