Pennsylvania Gov. Ed Rendell (D) charged today that Republican presidential candidate John McCainJohn Sidney McCainJuan Williams: Time for boldness from Biden Democrats lead in three battleground Senate races: poll Republican Scott Taylor wins Virginia primary, to face Elaine Luria in rematch MORE would increase the tax burden on middle class families if he wins the White House.

Rendell cited McCain's proposal to eliminate the current federal tax exemption for the premiums paid to buy health insurance through employers. Under that proposal, the money would be subject to income tax for the first time since the exemption was created in the post-World War II era.

McCain also proposed, however, to provide tax credits of up to $5,000 to replace the tax exemption.

"He not only doesn't want to cut taxes on the middle class, he wants to increase taxes on the middle class," Rendell said at an event Wednesday sponsored by the Service Employees International Union and the liberal healthcare group Families USA.

- Jeffrey Young