Two examples that stuck out to me were:

–on the stimulus, Ryan tried to argue it was a failure and a waste of taxpayers dollars yet had no coherent response when Biden pointed out that Ryan himself had made various successful requests for stimulus funds (see here).

–on their $5 trillion tax cut, Rom/Ry really need to either start naming the loopholes they’d close to pay for it or just admit they can’t make it revenue neutral without whacking the middle class. The vice president was appropriately relentless on this point. Even I’m starting to feel sorry for them every time someone brings up this little flaw in their plan. I suspect I’m not alone in realizing that this country simply can’t afford to elect people promising a tax cut of this magnitude who, when it comes to paying for it, essentially say “trust us, we’ll find a bipartisan solution.”

One final revealing point on this.  In our post-debate discussion on CNBC, Larry Kudlow and I had a friendly argument about the following (we strongly disagree, but I respect and like Larry a great deal). He claimed, correctly, that you could offset the full cost of the Romney cuts by cutting tax expenditures (i.e., loopholes, base broadeners) because the Treasury forgoes about $1 trillion per year in these measures (while their tax cut costs $5 trillion over 10 years).

But, as I pointed out, Gov. Romney has already taken capital gains and dividends–for example–off the table. Now, here’s the revealing part: Larry said, and I know many in the investment community, including Mitt, feel exactly the same way, “I don’t consider those loopholes.”

And therein lies the problem. First, the $1 trillion includes these very tax expenditures, so you can’t say that amount is available to offset the tax cut and in the same breath take a chunk off the table. Second, to the investment community, this isn’t a loophole at all–it’s a job-and-growth-creating incentive. To the housing industry – and many in the middle class – the mortgage interest deduction isn’t a loophole: it’s a ticket to the American dream of home-ownership (and, in fact, as quoted here, Mitt alludes to protecting the mortgage interest and charitable deductions as well).

Gov. Romney and Rep. Ryan may want to keep these waters as muddy as they can in order to sell yet another massive tax cut we don’t need and can’t afford. Moreover, they want to sell in a way that seems costless. But Vice President Biden was having none of it tonight and as a result, the electorate is better informed.

And somewhere in those 90-minutes, I suspect he also re-energized a bunch of recently dispirited Democrats.
A fine day’s work, Mr Vice President.

Bernstein is a senior fellow at the Center for Budget and Policy Priorities, from which he is currently on leave. From 2009-2011 he served as chief economist and chief economic adviser to Vice President Joe BidenJoe BidenBiden blasts Dems for ignoring working-class concerns The Hill's 12:30 Report Cornell unveils Biden ice cream MORE. He also served as executive director of the White House Task Force on the Middle Class, and a member of President Obama’s economic team. You can read his blog "On the Economy" where this post originally appeared.