A key gun control measure has failed a Senate vote. The proposal to expand background checks for people buying guns online and at gun shows backed by Sens. Joe Manchin, D-W.Va., and Pat Toomey, R-Pa., fell six votes short of winning the 60 votes needed to pass. The vote was 54 to 46. Vice President Biden was presiding over the Senate and announced the vote. The amendment's failure is a striking defeat for President Obama and supporters of gun control in the wake of the shooting four months ago in Newtown. Several family members were seated in the Senate gallery at the time of the vote. Earlier today Manchin told ABC News that regardless of the vote's outcome, the need to impose new gun measures, "would not go away."