Where did you hear that?
Where else? Right here. Some enterprising FReeper uncovered it on the AP website. I'll go find it and ping you.
From search FR for "AP" and "boos":
And, from search FR for "AP" and "booing":
The AP Changes "Boos" to "Ooohs" (Finally getting the truth out)
Posted by MaineRepublic
On News/Activism 09/04/2004 5:01:21 AM PDT · 102 replies · 1,992+ views
Editor and Publisher ^
The AP Changes "Boos" to "Ooohs" in Report on Bush and Clinton
Posted by BigSkyFreeper
On News/Activism 09/03/2004 9:40:17 PM PDT · 63 replies · 1,699+ views
Editor & Publisher ^ | 3 September 2004 | E&P Staff
Drudge Updating AP Lie
(Audience boos as Bush offers best wishes for Clinton's recovery)
Posted by Rokke
On News/Activism 09/03/2004 1:47:30 PM PDT · 44 replies · 2,387+ views
Drudge Report ^ | 3 Spet 2004 | Drudge
AP CAUGHT LYING: No boos at Bush rally in Wisconsin
(I was there)
Posted by Trust but Verify
On News/Activism 09/03/2004 1:04:48 PM PDT · 187 replies · 10,048+ views
9/3/2004 | Trust but Verify
Booing the AP(AP reporter ID'ed using Lexis-Nexis)
Posted by Dog
On News/Activism 09/04/2004 5:36:40 AM PDT · 145 replies · 3,949+ views
Galley Slaves blog ^ | Sept 3 2004 | Jonathan V. Last
Drudge has audio for AP lies: Booing incident
Posted by ETERNAL WARMING
On News/Activism 09/04/2004 12:43:47 AM PDT · 11 replies · 674+ views
Drudge Report ^ | Sep 4, 2004 | Matt Drudge
AP LIES ABOUT GOP BOOING CLINTON AND REFERS TO BABY KILLING TERRORISTS IN RUSSIA AS "REBELS"
Posted by crushelits
On Bloggers & Personal 09/03/2004 8:02:24 PM PDT · 3 replies · 118+ views
Crushkerry ^ | September 3, 2004 | Crushkerry
AP Flat out lied about booing Clintons health (Audio of cheers!)
Posted by Phantom Lord
On News/Activism 09/03/2004 7:21:09 PM PDT · 46 replies · 1,822+ views
Fox News Audio ^
Clinton to Undergo Bypass Surgery (PEOPLE, THE AP BOOING LIE IS SPREADING!!)
Posted by MaineRepublic
On News/Activism 09/03/2004 5:31:21 PM PDT · 121 replies · 3,496+ views
sunherald.com ^