A Kansas congressman’s legislation seeking a constitutional amendment to ban gay marriage has picked up more support, but not from his Kansas colleagues.

Republican Rep. Tim Huelskamp’s bill has picked up at least 47 co-sponsors in the U.S. House since its introduction a month ago. That includes 20 supporters added in July.

The Hutchinson News reports that absent from the list of co-sponsors are Kansas’ other three House members, all Republicans.

U.S. Rep. Mike Pompeo says he strongly believes in defending traditional marriage and is looking at the amendment carefully. Reps. Kevin Yoder and Lynn Jenkins declined comment.

Huelskamp’s legislation is currently in a subcommittee. He introduced it after the U.S. Supreme Court struck down a key provision of the federal Defense of Marriage Act in June.

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Information from: The Hutchinson News, http://www.hutchnews.com