Okay, I suppose you can characterize the supporters of MoveOn.org as wanna-be big spenders. Although to be fair, that's not synonymous with wanting to run big deficits, since they'd be happy to raise taxes as much as possible to cover their spending with more revenue. (Even though raising tax rates is likely to actually depress revenues, but liberals don't know that; they'll point to Clinton's big tax hikes, and the eventual budget surplus five or six years later, to attempt to justify their anti-deficit credentials.)
But if the Democrats are wanna-be big spenders, Bush and the Republican Congress are real here-and-now giant spenders. From farm subsidies to federal education spending (whatever happened to "abolishing the Education Department"?) to prescription drug entitlements to Mars missions, the Republicans appear intent on replacing Democrats as the principle promoters of Big Government.
So the MoveOn.org ad is absolutely accurate and justified. If it hurts President Bush politically, well, he deserves to take the hit.