From NBC's Mark Murray
The Obama campaign's latest TV ad highlights its online tax calculator to make the case that Obama's tax plan gives middle-class Americans a larger tax cut than McCain's does.

Script:
Not sure who to believe on taxes?
Try this.
Enter your income, marital status, number of kids.
Then click.
A nurse earning sixty grand?  You get a thousand bucks under Obama.  
Under McCain…just one-fifty.
The independent Tax Policy Center says Obama offers middle class tax cuts three times as big as McCain's.
Even leading conservatives say Obama's plan is better for the middle class.
One point five million have tried it.
You should too.
I'm Barack Obama and I approve this message.