How come Cardinal Mahony didn't guide his flock about not voting for pro-aborts?

To guide its flock before today's election, the Diocese of La Crosse, Wisconsin, has posted on its web site a bunch of links (click on this post's title) to statements by U.S. bishops about how Catholics may not morally vote for pro-abortion candidates.

How come Cardinal Roger Mahony of Los Angeles has not done that? What could possibly be the reason(s)?