Intimidation (the incumbent mayor would call on people who are for the opposition, the admin mayoral candidate scolding people out in the open, and armed people visiting various houses)
This has been going on since the political campaigns started but the efforts have been intensifying in the past few weeks. No one would even dare report incidents to authorities because the mayor in question is still in power. More details can be found here: http://emarrah.wordpress.com/2013/05/11/calamba-misamis-occidental-untold-stories-of-fear/