It was a day late, but the Republicans’ parade of truth-twisting, distortions and plain falsehoods arrived on the podium of their national convention on Tuesday. Following in the footsteps of Mitt Romney’s campaign, rarely have so many convention speeches been based on such shaky foundations.


Gov. Chris Christie of New Jersey, in the keynote speech, angrily demanded that the American people learn the hard truths about the two parties, but like most of those at the microphone, he failed to supply any. He said his state needed his austere discipline of slashed budgets, canceled public projects and broken public unions, but did not mention that New Jersey now has a higher unemployment rate than when he took over, and never had the revenue boom he promised from tax cuts.


“We believe in telling our seniors the truth about our overburdened entitlements,” he said, but his party has consistently refused to come clean about its real plans to undo Medicare and Medicaid. “Mitt Romney will tell us the hard truths we need to hear to put us back on a path to growth,” he said, but Mr. Romney has consistently refused to tell the truth about his tax plan, his budget plan, and his health care plan.


It was appropriate that “We built it,” the needling slogan of the evening, was painted on the side of the convention hall. Speaker after speaker alluded to the phrase in an entire day based on the thinnest of reeds — a poorly phrased remark by the president, deliberately taken out of context. President Obama was making the obvious point that all businesses rely to some extent on the work and services of government. But Mr. Romney has twisted it to suggest that Mr. Obama believes all businesses are creatures of the government, and so the convention had to parrot the line.


“We need a president who will say to a small businesswoman: Congratulations, we applaud your success, you did make that happen, you did build that,” said Gov. Bob McDonnell of Virginia. “Big government didn’t build America; you built America!”


That was far from the only piece of nonsense on the menu, only the most frequently repeated one. Conventions are always full of cheap applause lines and over-the-top attacks, but it was startling to hear how many speakers in Tampa considered it acceptable to make points that had no basis in reality.


Gov. John Kasich of Ohio, for example, boasted of the booming economy in his state, never mentioning that he and Mr. Romney opposed the auto bailout that has played an outsized role in the state’s recovery. (Apparently Mr. Obama’s destructive economic policies do not apply everywhere.)


Andy Barr, a Congressional candidate in Kentucky, made the particularly egregious charge that the president was conducting “a war on coal,” ruthlessly attacking an industry and thousands of struggling miners.


He was apparently referring to the Environmental Protection Agency’s efforts to limit greenhouse gas emissions and prevent power-plant pollution from drifting through the East Coast states. The country desperately needs to reduce its reliance on coal, which is far more polluting than natural gas, but that goal gets harder to achieve every time someone like Mr. Barr makes it out to be an attack on a way of life.


Considering how Mr. Romney has conducted his campaign so far, most recently his blatantly false advertising accusing Mr. Obama of gutting the work requirement on welfare, it is probably not surprising that the convention he leads would follow a similar path.


Voters looking for a few nuggets of truth would not have found them in Tampa on Tuesday.