(The metric there is American school grade levels.)
But don’t worry:
“It’s tempting to read this as a dumbing down of the bully pulpit,” [former Clinton speechwriter Jeff] Shesol said. “But it’s actually a sign of democratization. In the early Republic, presidents could assume that they were speaking to audiences made up mostly of men like themselves: educated, civic-minded landowners. These, of course, were the only Americans with the right to vote. But over time, the franchise expanded and presidential appeals had to reach a broader audience.”
It just looks like escalating cretinization. Really it’s Democracy®! Yay!