What do you do when an entire speech is based on a lie?

You write this:

THE RECENT CLAIMS by Mitt Romney's campaign about President Obama's welfare-to-work program have been awarded the top dishonesty rating of "four Pinocchios" from the Washington Post and called "wrong" by CNN, a "pants on fire" lie by the Pulitzer Prize-winning Politifact and "simply not true" by Factcheck.org.

But Tuesday night at the Republican National Committee in Tampa, Rick Santorum called those false claims something else: a main talking point.

The former Pennsylvania senator - who came the closest to derailing Romney during the 2012 GOP primaries - picked up a key Romney attack line when he told delegates that "this summer [Obama] showed us once again he believes in government handouts and dependency by waiving the work requirement for welfare.

Summing up:

In addition, media critics have wondered why more news outlets aren't more aggressive in calling out a presidential campaign that keeps repeating a called-out lie. Fair enough: When Santorum alleged that Obama is getting rid of welfare-work requirements, he simply wasn't telling the truth.