In playing around a little with SQL, I've found that I can perform
this query that gets me close to what I'd like, with a bit of
processing:

select stores.id, stores.name, utms.name from stores left join utms on
stores.id = utms.store_id

The results from sqlite shows:
1|167|
2|191|02:05:06:08:07:08

In this situation, store 167 does not have a UTM assigned, and store
191 does.  I'd only want the records that had empty values returned
for the utms.name column.  (Except that I'd also want the one that was
assigned to this particular UTM)

I've found options_for_association_conditions, which looks like what I
want to filter this, but I'm not familiar enough with Ruby to
translate this SQL into what I want...  (though I'd prefer a better,
more general API supported way)

Any help there would be greatly appreciated.

As a stop gap, I've implemented some validations to make sure the same
store doesn't end up getting two different UTMs assigned to it, like
so:
validates_uniqueness_of :store_id, :allow_nil => true
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