Weeks ago Clinton admitted she made “misspoke” while recounting a trip she took to Bosnia as First Lady in which she alleged she encountered sniper fire. Her former president husband Bill Clinton recently defended her story saying his wife was “exhausted” when she told the story, although she told it on multiple occasions.

Obama is winning with the popular vote and delegate counts, but has not secured enough delegates to win the Democratic nomination outright. Clinton has vowed to take the Democratic primaries to the convention in August. In the meantime Clinton surrogates have argued to the party’s superdelegates, who are expected to ultimately determine the Democratic nominee, that Clinton would be a better candidate to face-off against GOP presidential nominee John McCain in a general election.

Part of her argument relies on Obama’s relationship with his longtime friend and controversial pastor Rev. Jeremiah Wright, who was exposed making anti-American and racist statements in videos sold by his church.

The debate will be held at Philadelphia’s National Constitution Center. ABC Anchors Charles Gibson and George Stephanopoulos will moderate.

ABC News is restricting other networks from airing video of the debate in the hours after it concludes. Other networks will only be permitted to air a single 30-second clip of the debate on their stations and websites in the hours between 11 p.m. Wednesday and 5 a.m. Thursday.

An ABC spokesman told the New York Times, “We have an obligation to our West Coast affiliates to not make chunks of the debate available until their viewers have had a chance to see them.”