I've spent a little time this morning googling interracial marriage lawsuits, and haven't found any stories of such... but because there is so many references to interracial marriage in modern gay-marriage lawsuits, there's a lot of filtering that needs to be done.
Still, even when I take out the obvious keywords about gay marriage, I don't see any information about lawsuits forcing bakers or florists to to participate in them or to suffer some kind of legal penalty. All I can find is a case of a Louisiana Justice of the Peace who refused to issue a marriage license in 2009 (hardly "history"... more like current events).
Were there no cake bakers or florists who refused to serve interracial couples? Or did they refuse, but there were no lawsuits... or were there lawsuits, but because it was pre-Internet it's just hard to find historical articles on the matter?
it isn't a good comparison because the law is different. discrimination on the basis of race is banned by 1964 civil rights act (loving was 67) and at the time the Sherbert test was in effect. it's pretty much the same as RFRA but it's judicial not statutory. The problem there is these are all cases about religious freedom exemptions not general exemptions and 60s race cases like these weren't argued on religious grounds. SSM and interracial marriage really get different stated reasons for opposition and the general antidiscrimination laws (not constitutional mandates) don't apply to say relationships unless they are explicitly included