Vandals spray painted the words "scum" and "criminal" on the garage of Sen. Norm Coleman (R-Minn.), who is locked in a tight re-election race.

Using black paint, someone wrote out "U R A CRIMINAL RESIGN OR ELSE!" on Coleman's garage door at his home in St. Paul, reports KMSP, the Fox affiliate in the Twin Cities. "PSALM 2" and "scum" were also written on the door. The police are investigating. The vandalism was spotted was spotted Wednesday morning.

Coleman faces a challenge to his seat from Democrat Al Franken.