Obama promised to eliminate left over random nuclear stuff that could be used to build either "clean" or "dirty" bombs, material that was distributed among several countries, by the end of this year (2013). We have yet to see if that task can be completed, but apparently it is on schedule.
Now, we have to get the Republicans to do the right thing and agree to the trimming down of our nuclear arsenal. That is actually more likely than it sounds. Here are all the details: