The votes of 50 Grinnell College students are being challenged. 

Two Poweshiek County Republican leaders have formally challenged the absentee ballots cast by 50 Grinnell students. The Republicans say the students listed the main campus address and a post office box on their registration rather than the specific street address where they live.

Each Grinnell student has a post office box. The county auditor says students at Grinnell College have used their post office box number and the main campus address in past elections without any complaints.

The 50 contested ballots have been set aside and will be reviewed Thursday. The ballots could prove significant if a local legislative race in the Grinnell area is close.