Well, it's going to have to come from spending.
Tell him what he's won, Johnny!
Actually, it comes from debt.

The 'pledge' would be more believable if they would stop pleading, and next time they're in charge they actually do reduce spending and all the other stuff they like to talk about but never do. THEN, once you have an ounce of credibility and some sort of surplus to back up lost revenue, you can talk about tax cuts.

Oh, and ElNono, do you believe Congress will spend the additional tax revenues responsibly?
They probably won't. But I also don't think they'll stop spending, period.
From that perspective, I would rather they actually pay for some of those obligations instead of keep on charging them on the proverbial credit card.

And BTW, this goes beyond parties. Clinton and his goal to close the budgetary gap in times of economic boom was a rarity, IMO.