Point out that tax revenues are only 60% of what the government spends. That would require Obama to raise taxes 40% by his favored solution- not gonna happen. So a second Obama term would mean a continuation of a Japan style lost decade (lost two decades), and perhaps a slide into hyperinflation. No jobs, slow growth, declining wages, no problems solved.
Actually, they would have to be raised by close to 70% (it's not simple addition and subtraction ... simple example ... if revenues were 50% of spending, taxes would have to increase 100%)