THE epidemic of gun violence in our country is a crisis. Gun deaths and injuries constitute one of the greatest threats to public health and to the safety of the American people. Every year, more than 30,000 Americans have their lives cut short by guns. Suicides. Domestic violence. Gang shootouts. Accidents. Hundreds of thousands of Americans have lost brothers and sisters, or buried their own children. We’re the only advanced nation on earth that sees this kind of mass violence with this frequency.

A national crisis like this demands a national response. Reducing gun violence will be hard. It’s clear that common-sense gun reform won’t happen during this Congress. It won’t happen during my presidency. Still, there are steps we can take now to save lives. And all of us — at every level of government, in the private sector and as citizens — have to do our part.

We all have a responsibility.

On Tuesday, I announced new steps I am taking within my legal authority to protect the American people and keep guns out of the hands of criminals and dangerous people. They include making sure that anybody engaged in the business of selling firearms conducts background checks, expanding access to mental health treatment and improving gun safety technology. These actions won’t prevent every act of violence, or save every life — but if even one life is spared, they will be well worth the effort.

Even as I continue to take every action possible as president, I will also take every action I can as a citizen. I will not campaign for, vote for or support any candidate, even in my own party, who does not support common-sense gun reform. And if the 90 percent of Americans who do support common-sense gun reforms join me, we will elect the leadership we deserve.