Various surveys indicate that at least 80% of Americans support universal background checks for gun sales. Many surveys, including the Quinnipiac University survey cited by the Obama administration, show support above 90%.
There are plenty of issues about the latest push to reduce gun violence on which the population is divided. Background checks is not one those issues. The only division is in Congress, between those members who represent their constituency and those who represent other interests.
Obstructing this legislation impairs the credibility of other arguments. Congress should pass legislation for background checks, and then move on to debate issues which are actually debatable.