The only hurdle left to clear in the attempt to repeal the military's "Don't Ask, Don't Tell" (DADT) policy is the Republican Party in the Senate. The military basically says "no big whoop" to the repeal, though they very clearly want Congress--not the courts--to do it. The American people are behind a repeal. The House of Representatives already approved it. That leaves Grampy McCain and his stubborn, apparent homophobia. And also, a GOP that seems determined not to agree with anything the President wants done, even if it has popular support.
For liberals--particularly gay liberals--the most important thing beyond a success is that if it loses, it better all hang on the GOP. If Harry Reid can't caucus every single Democrat, there's going to be a firestorm.