As it happens, the study compared the actual Dem plan with the GOP one. And it found that for a family of four with an income of $40,000, the Dem plan -- continuing the low end tax cuts, plus the stimulus measures -- would cause a 7.8 percent jump in after-tax income. That jump would only be 6.8 percent under the GOP plan to continue all the Bush tax cuts.

For a single parent with two kids and an income of $20,000, that difference is even more pronounced. The jump is 8 percent under the Dem plan, and only 4.4 percent under the GOP one.

In fairness to the RNC, the study is good for the GOP in one sense. It confirms that the Bush tax cuts were helpful to the poor, despite popular belief that they only helped the rich. But the author of the study, Nick Kasprak, confirms that this finding isn't directly relevant to what Dems have proposed.

"Our study shows that the Bush tax cuts helped the poor a lot more than the popular perception, so the RNC is right to send it around for that reason," Kasprak tells me. "But the study also shows that the Congressional Democrats' plan is more generous to the poor, because it extends certain stimulus provisions into 2011, which the Republican plan does not. That isn't what the RNC wants to show."