This spring, four House Republicans used money from their Congressional office accounts to send five staff members to a training seminar run by a conservative Christian group in Indiana that is leading the charge in the state for an amendment to ban gay marriage.

The expense, totaling $2,500 for the group, is a perfectly legal use of taxpayer money, but it highlights the broad array of things Members of Congress can pay for out of their office accounts. The payments also underscore the tight web of relationships Members can build with favored causes without violating rules against using taxpayer money to fund political activity.

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