Mankiw posts this video of Obama economic advisor Austan Goolsbee being interviewed on economic policy.
In previous posts Mankiw has showed the fact that, under Obama's current tax plan, effective marginal corporate tax rates would rise pretty substantially.
But he neglects to say that, as Austan points out in the interview, the US reaps some of the smallest tax revenues as a percent of GDP in the entire world. So, slight laffer effects aside (which history shows to be minimal), having companies pay a bit more than they already are (either due to current subsidies or loopholes) makes sense to me at evening the playing field and increasing revenues overall.
Also as Austan points out, eliminating some of the subsidies large corporations currently receive for shipping jobs overseas means more jobs / businesses staying here, which means more revenue and/or may eliminate the need to let the marginal tax rates to go back to the 1990s level to the same degree.