On the PBS NewsHour Tonight

NEWSHOUR -- October 3, 2012 at 12:14 PM EDT

On the PBS NewsHour Tonight

On Wednesday's NewsHour:

Mark Shields and David Brooks preview the first presidential debate
Early voting begins in the swing state of Iowa
Loose seats and labor troubles for American Airlines
And a breakthrough in genetic testing for critically ill newborns

Correspondent Margaret Warner has your preview:

While the above radio promo is recorded in the morning, it's a tentative snapshot of what we're covering on the show. With the ebb and flow of news headlines, chances are segments will be added, scrapped or moved to another night. Come back to this page for updates throughout the day.

Tune in to the regular broadcast at 6 p.m. ET online, and on-air. Then, watch NewsHour's live coverage and post-debate analysis that will begin shortly before the first presidential debate in Denver tees off at 9 p.m. ET. Anchors Judy Woodruff and Gwen Ifill will be joined in the studio by political analysts Mark Shields and David Brooks.

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