Who were the greenest Presidents in US history? The Bushes.
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Explanation
Explain Bear
Listen here, genius. This joke is playing on the word "greenest." You see, it could mean environmentally friendly. But, like, it also sounds like the last name "Bush." The joke is that the "Bushes" are the "greenest" presidents, get it? I bet you didn't even know that George H.W. Bush and George W. Bush were presidents, you dunce.