I've read quite a few comments on the internet claiming that politicians will use this as an excuse to enact more gun control. Yet AFAIA neither Obama nor Romney have uttered the term "gun control" since the tragedy, and, as was previously noted, the support for gun control in Congress is shrinking.
Well, people get worried because whenever this sort of thing happens leftists in journalism write op-eds praising gun control. Ultimately, politicians are smarter than that; polling right after the tragedy showed 72% of the country against gun control and 68% with a positive opinion of the NRA. You don't get on the wrong side of that.