In the past month, ABC and NBC have been battling over rights to air the next debate between Democratic presidential candidates Sen. Hillary Clinton and Sen. Barack Obama.

After the two networks lobbied both campaigns, ABC won out and will televise the 90-minute debate on Wednesday, April 16 beginning at 8 p.m. EDT on the East Coast and tape-delayed at 8 p.m. PDT for the West Coast.

The faceoff will take place at the National Constitutional Center in Philadelphia six days before the Pennsylvania primary.  "World News" anchor Charles Gibson and "This Week" host George Stephanopoulos will serve as moderators.

ABC's pitch for a debate preceding the April 22 primary was one of seven offered to both campaigns. NBC, which so far has televised its debates on cable channel MSNBC, would have aired this debate on its broadcast network.