Yesterday, the Republican National Committee released a web ad featuring the voice of Solicitor General Donald Verrilli haltingly defending the Affordable Care Act. After saying that “For more than 80 percent of Americans, the, ah, insurance system does provide effective access,” Verrilli trails off, coughing and stuttering for an incredibly long time.

But as Bloomberg News revealed, the awkward silence isn’t credible. It’s entirely doctored. In the actual audio of the case, Verrilli pauses only briefly before continuing “But for more than 40 million who do not have access to health insurance, either through their employer or through government programs such as Medicare or Medicaid, the system does not work.

Tom Goldstein of SCOTUSblog calls it “the single most classless and misleading thing I’ve ever seen related to the Court,” and he’s right.  But it shouldn’t come as any surprise that this is the tack taken by the GOP. From day one, Republicans decided that the best way to oppose President Obama’s health care reform agenda was by lying about it. Whether it’s about death panels, rationed care or the Solicitor General’ performance before the Supreme Court, Republicans have made clear that there’s no lie they won’t tell in order to damage the president and frustrate his agenda.

After the Citizens United decision, we’ve seen outside groups pushing sleazy “Swift Boat” style attack ads. The fact that the RNC itself chose to push such a blatant lie only underscores how comfortable with dishonesty–and how desperate–the party has become.

Republican leaders, including presidential contenders who hope to lead the party, should renounce these dishonest attacks.