In late November when Newt was running around blathering about how he would show up at each of Obama's campaign stops and challenge him to a L-D debate, and Newt enjoined both Cain and Huntsman in an L-D debate, Santorum also challenged Newt to a one-on-one.
Shortly thereafter, Newt's campaign went entirely silent on the matter. The Santorum campaign has not received a reply. If Newt had challenged a candidate to a debate and the other party failed to reply, every post from Newt fans on the matter would include the word, "chicken" or "coward."
They had a debate. Read Post 59.