Today the Obama campaign accused Sen. John McCain of repeatedly lying about his running mate’s record.

Rebutting a new Republican ad — which TWI’s Matt DeLong reports here — chief Obama spokesperson Bill Burton blasted McCain for lying about an earmark issue after multiple corrections from the press:

Despite being discredited over and over again by numerous news organizations, the McCain campaign continues to repeat the lie that Sarah Palin stopped the Bridge to Nowhere.

That’s unusually strong for the Obama campaign — which regularly describes McCain’s questionable remarks as “dishonest” or “spin.”

Even this press release, for example, was still titled “Response to New and Dishonest McCain Ad,” rather than, say, “McCain is Lying Again.” I emailed Burton to ask whether this is the first time he has directly accused the McCain campaign of lying, and will report back with any response.