The direct quote
Turns out this is what Eisenhower really said in that quote that's been going around. I got this from Snopes, who says it's true:
Should any political party attempt to abolish social security, unemployment insurance, and eliminate labor laws and farm programs, you would not hear of that party again in our political history. There is a tiny splinter group, of course, that believes you can do these things. Among them are H. L. Hunt (you possibly know his background), a few other Texas oil millionaires, and an occasional politician or business man from other areas. Their number is negligible and they are stupid.
Just thought you'd like to know, Mr. Zakofsky.