Imbalancing the Budget

I'm the first one to admit I know nothing about economics. It anyone wants proof they need only look at my net worth. But still, I expect the government to handle finances better than I do. So how is it that while tax revenues go down because of cuts, the spending goes up? I mean, aren't all those people losing homes in the collapse of the prime lending maket precisely because they tried to spend more than they had? Where's the logic of having a budget that increases the national deficit, and war costs that are "hidden?" And how do we find the bucks to run around the world handing out money to third world countries like a drunken sailor? Not that I'm against spreading wealth around, but when you're several trillion dollars in the hole, where the heck does it come from? Could one of the candidates for president please explain it to me.