There are certainly elements of truth in the article linked in the OP, but it's hard to read when it's full of logical fallacies, blanket statements made without evidence to back them up, and ideological attacks from an obviously jaded ex-republican. I'm sure he's pushing some book or trying to get into the Obama cabinet or something.
One of the main things he conveniently ignores time and time again is that the budget and spending is controlled by congress, not by the president. He's right that republicans went off the rails when they started the notion of tax cuts without spending cuts to offset the revenue decline, but he fails to mention that (for example) even during the Reagan years, the democrats held congress, and thus controlled both taxation and budgeting, not the GOP.
He says spending is not the problem, but that tax cuts are the devil, when in fact anyone even halfway rational would realize that neither is necessarily a problem, so long as they are balanced. If you want to cut taxes, you must cut spending to match. If you want to increase spending, then you must increase taxation (revenue) to pay for it. That's the reality. And spending/taxation are in the hands of... you guessed it.. congress.
In fact, congress has been largely in democratic hands for the past 40 years (the time frame the author is talking about). A quick breakdown: democrats controlled BOTH houses of congress for more than 22 years of those 40 years, the republicans controlled both houses for 10 of those 40 years (the remaining 8 years being split).
Bottom line: a combination of reckless spending and government policies (including tax cuts) have put us in the situation where we are now. Laying the blame on one party is stupid and naive (or simple partisan hackery), especially when the facts don't support that party having control of the budget, legislation or spending the vast majority of the time.