I too am a conservative. However I DO NOT place such motivation on Mr Obama. I believe that he, like many far left liberals, he genuinely believes that the government knows better How to live our lives then we do. I certainly don't agree, not even a bit, but lets be honest. Lets focus on what us true about our president and STOP attributing these ridicules motives/actions (ie. everyone will have a gps chop implanted in then) to him.
It is curious why they have so much ammo stored. It's not the kind for practice shooting either it is hollow point bullets that can rip a person apart. As far as Obama seizing power, it could happen just like it has happened throughout history, but I highly doubt it. He prefers to do it through executive orders not violence. I think the excess ammo is for the riots that might happen when our country runs out of other people's money to fund all the feel good legislation and the Conservative's of the world begin to SHRUG.
Obviously, there are a lot of differing opinions/ideas as to why Homeland Security would be stockpiling ammunition. Perhaps they're for expected riots that could happen in the near future, or a sudden shortage of ammo, or it could also be that they're expecting a civil war (or rebellion against the government, whatever you want to call it). I'm not going to tell you what I think it is, but, rather, am going to encourage you to be prepared for the extreme. Something could happen that will likely affect you. So, get in shape, eat right, live healthy. Because I think it's likely that (especially in these next four years) your health/fitness level could very well be your death sentence.