Which US president said that he was shocked that half of Americans have I.Q. score's less than 100?

One guy said along the lines of “It depends in what your definition of ‘is,’ is.” despite even the thickest unabridged dictionary you could find at that time had but one very simple definition for ‘is’. As Bugs Bunny would say, “What a maroon.”

The quote you are referring to is often attributed to President Lyndon B. Johnson. However, there is no evidence that he ever said this. It is possible that this quote was made up by someone else and then attributed to him. (per Bing AI)

“I can see Russia from my window.”

“I tried marijuana once, but I did not inhale”.

“If you have a windmill anywhere near your house, congratulations, your house just went down 75 percent in value, and they say the noise causes cancer. You tell me that one.”

”... it is just wonderful to be back in Oregon, and over the last 15 months we’ve traveled to every corner of the United States. I’ve now been in fifty…. seven states? I think one left to go. One left to go. Alaska and Hawaii, I was not allowed to go to even though I really wanted to visit but my staff would not justify it.”

“It is time for us to do what we have been doing. And that time is every day. Every day it is time for us to agree that there are things and tools that are available to us to slow this thing down.”

“They misunderestimated me.”

“So long as I’m the president, my measure of success is victory—and success.”

“This is my maiden voyage. My first speech since I was the president of the United States and I couldn’t think of a better place to give it than Calgary, Canada.”

G. W. Bush, in chronological order:

“I know the human being and fish can coexist peacefully.” —Saginaw, Michigan, September 29, 2000

“For every fatal shooting, there were roughly three nonfatal shootings. And, folks, this is unacceptable in America. It’s just unacceptable. And we’re going to do something about it.” —Philadelphia, Pennsylvania, May 14, 2001

“Do you have Blacks, too?” —to Brazilian President Fernando Cardoso, Washington, D.C., November 8, 2001

“People say, how can I help on this war against terror? How can I fight evil? You can do so by mentoring a child, by going into a shut-in’s house and say I love you.” —Washington, D.C., September 19, 2002

“You work three jobs?… Uniquely American, isn’t it? I mean, that is fantastic that you’re doing that.” —to a divorced mother of three, Omaha, Nebraska, February 4, 2005

“I would say the best moment of all was when I caught a 7.5-pound largemouth bass in my lake.” —on his best moment in office, interview with the German newspaper Bild am Sonntag, May 7, 2006

“You know, one of the hardest parts of my job is to connect Iraq to the war on terror.” —interview with CBS News’ Katie Couric, September 6, 2006

“I’ll be long gone before some smart person ever figures out what happened inside this Oval Office.” —Washington, D.C., May 12, 2008