We do have a good idea. The original bill passed by the house was objected to by many senators for not having enough protection for religious freedom. The current version the senate just passed added protections for religious non profits to not have to officiate or recognize same sex unions. Several of the senators listed above came up with their own amendments that they wanted added that would have afforded even more protection to religious organizations/businesses who want to discriminate against same sex marriages, but those amendments were rejected when Chuck Schumer realized he could get a filibuster proof majority with the way the bill is written now.