FILE - In this Wednesday, Dec. 5, 2012 file photo, Senate Appropriations Subcommittee on Department of Homeland Security Chairman Sen. Mary Landrieu, D-La., speaks to witnesses, during

 

              FILE - In this Wednesday, Dec. 5, 2012 file photo, Senate Appropriations Subcommittee on Department of Homeland Security Chairman Sen. Mary Landrieu, D-La., speaks to witnesses, during
FILE - In this Wednesday, Dec. 5, 2012 file photo, Senate Appropriations Subcommittee on Department of Homeland Security Chairman Sen. Mary Landrieu, D-La., speaks to witnesses, during a hearing, to examine Hurricane Sandy, in Washington. President Barack Obama's push for tougher gun measures and expanded background checks has placed several moderate Senate Democrats facing re-election next year in a bind, including Landrieu, forcing them to take sides on a deeply personal issue for rural voters. (AP Photo/Manuel Balce Ceneta, File)