The nonpartisan FactCheck.org criticizes John McCain’s new tax ad, Joe the Plumber:

Here is the summary of the criticism:

The McCain campaign has taken to denigrating some of Obama’s tax proposals as "welfare" rather than tax cuts. And it continues to mislead about who would see a tax increase.

• A new McCain-Palin Web ad characterizes Obama’s proposed refundable tax credits as "welfare." But McCain himself proposes refundable tax credits, too, as part of his health care plan, and calls them "reform."
• The ad also says "hard-working families" and "seniors" would pay higher taxes. But – need we say this again? – that would be true only for the affluent few, not for the many.