Not sure because I didn't hear it myself, but IMUS had Lehrer on his show the morning after and made mention of the softball questions he gave to Kerry.
Yes, I remember now that you mention it. There was a thread around here about Imus asking Lehrer about those questions, and Lehrer responding: "I have no idea what you're talking about.".
BTW, if you haven't seen this one, it's just a tad enlightening:
Lehrer's Bias in Presidential Debate- note the novel he wrote on this subject
http://www.freerepublic.com/focus/f-news/1232266/posts
From the review at amazon:
At Williamsburg, Va., a few weeks before election day, Bible-quoting, media-savvy Republican David Donald Meredith will debate an all-but-defeated Democratic challenger. But newspaperman Michael J. Howley, the debate moderator, and the panel of questioning journalists so fear the consequences of Meredith's impending presidency that they conspire to ruin him by dispensing with the set debate format and ambushing Meredith with damning, unpublished documents in Howley's possession. After the debate, the panel members become controversial media superstars.