As people learn more about the proposed gun laws, they are less supportive

Is the drop in support for gun control since shortly after Newtown due to memories fading or that people learn more about the legislation?  The media and Democrats always claim it is the former, but it isn't obvious how they can be certain about that.  Note for example how Democrats in New York and elsewhere feel the need to push through regulations before people even have a chance to read the legislation.  They seem to fear people being able to read the gun control bills.  From CBS News:

Currently, support for stricter gun control laws stands at 47 percent today, down from a high of 57 percent just after the shootings. Thirty-nine percent want those laws kept as they are, and another 11 percent want them made less strict. . . .

Indeed, if you look at the CBS News poll when it was done at other times, support for more gun control has only been lower at one other point during the previous six polls.

An earlier CNN also showed a similar drop.  

Although a majority of Americans favored major restrictions on guns or an outright ban in the wake of the shootings in Newtown, Connecticut, when a heavily armed gunman killed 20 young students and six adults, a new CNN/ORC International survey indicates that support has tumbled to just 43%, as more time has passed since that December tragedy. . . .