Police are searching for the driver, who fled the scene on foot.
The boys were apprehended Monday morning in Lyman County.
The vote will take place on August 2.
An apartment building was evacuated after the early morning shooting.
Good Earth State Park is the first state park in 40 years.
Sales tax is down about 1.5 percent so far in 2013.
The pair will stand trial in September.
The South Dakota Supreme Court will likely weigh in on the issue.
Paul Dean Jensen Jr. was sentenced to life in prison for a murder he committed when he was 14.
State transportation officials say the signs are not meant to carry any sort of statement.