I have to agree with NickelbackFan (1st commenter). But I never really thought of it as a politcal song at first. But when I think about it, it kinda is. In the begining of the song, he praises his girl, which is confusing, assuming this song is still about politicts. When he goes on to say "Amen I, I'm Alive", I get the feeling that for some reason he should be dead now? That it's only a miracle that of all the people dying in the world, he isn't "it" yet. I'm not sure what he meant by the fireflies analogy. Maybe the "They're only light" part meant that, again, he and her are only one (or I guess you could say two)? My favorite part is his analogy with the stars:

And as we lie beneath the stars We realize how small we are If they could love like you and me Imagine what the world could be

He's saying that him and his girl love each other so much, and that if everyone were that way, it would be a pretty d*** close utopia.

You notice how he says "If" a lot? He's acknowledging that it would be impossible, and that utopia is only a dream (an impossible one at that). In the end, I actually disagree with what he says ("We’d see the day, we’d see the day When nobody died"). Remember when God made the world, and man, and it was good? Well, didn't man choose to sin? So, even If everyone cared and nobody cried If everyone loved and nobody lied If everyone shared and swallowed their pride , I think there would still be the sin to hold us back.

That's only my interpretation. If you think otherwise, feel free to correct me. I'm always open for criticism. :-)