Someone threw three rocks through windows at Winona DFL Party headquarters the morning after Tuesday's election.

Two of the rocks pierced a poster of President-elect Barack Obama. DFL officials suspect the vandalism may have been in response to the outcome of the presidential election.

Winona County DFL Party Chairwoman Anne Morse calls the vandalism "a very overtly aggressive act."

No one was in the building at the time.

Police have no suspects. DFL officials replaced the glass but Morse kept the rocks as a reminder of the incident.