A Senate amendment that would have allowed licensed gun owners to carry concealed firearms across state lines was backed by six Democratic senators who are running for re-election in 2010.

Among those voting “aye” on the amendment, which received 58 votes but failed because 60 votes were required for adoption, were Senate Majority Leader Harry Reid of Nevada, Blanche Lincoln of Arkansas, Michael Bennet of Colorado, Evan Bayh of Indiana, Byron L. Dorgan of North Dakota and Russ Feingold of Wisconsin.