This is nothing new, per se.
As TPM reported last month, both the Democratic and the Republican plans for addressing the Bush tax cuts will add trillions to deficits relative to current law -- i.e., letting all the tax cuts expire. But the Republican plan, or an approximation of it, creates hundreds of billions of dollars more debt than the Democratic plan. Either way, it's a recipe for future tax hikes, drastic spending cuts, or fiscal calamity.
But amid the current political melee, Democrats are perfectly pleased to focus on the GOP plan alone. Expect them to make noise about this later today.