I would like to propose a new rule.
Anytime someone says we spend less money on X or if we spend more money on X things would be better for a group of people, they should be required to propose where the money will come from. Of course, liberals will always say they can get the money by raising taxes on the rich.
Do they have any other answer to that question? One reason we have the budget problems we do is that people always propose new spending but reducing spending is incredibly difficult because no one compares the relative benefits of spending on X versus Y. No one ever says spending money on X is more important than Y so let's shift government spending patterns. Instead, they say it would be beneficial to spend on X so let's spend on X.
Note: Updated Link. Difficult to know for certain what was originally linked to, but believe I found the right article. Original Link