Drum adds a wrinkle to Bartlett's argument:
If you raise taxes to pay for government programs, you're essentially making them expensive. Conversely, if you cut taxes, you're making government spending cheaper. So what does Econ 101 say happens when you reduce the price of something? Answer: demand for it goes up.
Cutting taxes makes government spending less expensive for taxpayers, which makes them want more of it. And politicians, obliging creatures that they are, are eager to give the people what they want. Result: lots of spending and lots of deficits.