An excerpt from a letter by Thomas Brejcha and Peter Breen at the Thomas Moore Society:
[There are] grave harms, yet unknown in type and intensity, that will afflict your constituents who are faithful Catholics, Evangelical Christians, Missouri Synod Lutherans, Muslims, Mormons, and Orthodox Jews. The harms listed above are only the likely harms foreseeable in the short-term.
The harms noted above do not begin to address the suffering of your constituents who must participate in and support same-sex unions: small bed & breakfast owners who would be forced to rent out their home for same-sex wedding weekends; solo photographers who would be forced to spend hours photographing and designing albums for same-sex wedding ceremonies that they believe to be sinful; family catering company owners being forced to prepare, feed, serve, and support same-sex wedding receptions, even though the family members oppose those receptions with every fiber of their being. In other states, such businesses have been fined and subject to injunctions, some even permanently shutting down to avoid legal penalty.
A “yes” vote will inflict these harms, all for the sake of giving the title “married” to some number of the fewer than 1% of Illinois households headed by same-sex couples.