The governor was trying to defuse Hispanic lawmakers who were irked the bills became law that way.
Blagojevich said his staff set the bills aside to look at scheduling a bill-signing event in the Latino community, but because of a mixup, the bills sat around until they became law Tuesday.
The Illinois Republican Party issued a statement saying Blagojevich was shirking his constitutional duties.
A bill is enacted by default if the governor fails to act on it within 60 days after receiving it.
Not since 1939 have lawyers in the secretary of state's office found such an instance.