My understanding is that Hallmark has made contributions to anti-gun organizations. They shouldn't have any conservative customers.
I never realized how liberal they are, although my cousin was a Hallmark artist in Kansas City for awhile and said the artists were such a motley looking bunch, and could come to work at any time provided they put in 8 hrs, but they had to use a separate side door and weren't allowed to parade through the "main" entrance!
Hallmark not only makes contributions, they campaign their anti-gun position.