WASHINGTON — A Senate minority successfully blocked an amendment aimed at ending discrimination against same-sex marriage benefits for veterans Thursday.

With the U.S. Supreme Court set to rule on same-sex marriage, 53 senators voted for the amendment sponsored by Sen. Jeanne Shaheen, D-New Hampshire, seven shy of the 60 needed under the rules.

Her amendment would have deferred the definition of marriage for qualifying for veterans benefits to the state where the marriage was issued.

Eight Republicans joined Democrats in support of the amendment: Kelly Ayotte of New Hampshire, Shelley Moore Capito of West Virginia, Susan Collins of Maine, Ron Johnson of Wisconsin, Mark S. Kirk of Illinois, Lisa Murkowski of Alaska, Jeff Flake of Arizona and Rob Portman of Ohio.

One Democrat, Barbara Boxer of California, did not vote.

CQ-Roll Call writers Steven T. Dennis and Kayla Webb contributed to this report.

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