Congress faces a battle over gun laws that could be the biggest in a generation.
Leading the charge for gun rights is the National Rifle Association, with its huge budget and grass-roots operations. On the other side, a new leader has emerged in recent years: New York Mayor Michael Bloomberg is not only outspoken on gun control, he has also opened his substantial wallet for the cause.
After spending millions of dollars in the presidential and Senate campaigns with little to show for it, many superPACs and other outside groups are still tending their wounds. But it's too soon to write off superPACs as a waste of wealthy donors' money.
Consider, for instance, this upset in a congressional race outside Los Angeles.