90%

"90% of Americans support new gun controls" is a canard.

/kəˈnär(d)/ Noun -- An unfounded rumor or story.

Sorta like a lie, except some people are ignorant it is a lie.  If someone says it, tell them it's wrong and a canard.  If they say it again you can call the a liar.

Sorta like the canard "75% (or whatever) of the guns in Mexico come from US gun stores."

There was a poll done shortly after Newtown, with emotions running high, where we don't know the question asked, but it was about background checks, and the people polled had no idea what kind of legislation would come to bring about back ground checks, but had assume a law expanding them that came around would match what was in their head, and before they could even know what the bill would look like, and even THEN, can we really trust the pollsters...

Well, time passed, people informed themselves, people argued, and it is certainly not "90% of Americans support new gun controls," or even "background checks" now.  It is not true now and probably never was.

It is a canard.  A lie.