From the Bangkok Post:

… threats continue to be made against Democrat candidate Panich Vikitsreth. A group of people banged on the police vehicle that took Mr Panich to the district office on the day he registered his candidacy and when he was about to start his campaign. He has also received threatening phone calls and other callers have cursed him. His campaign posters are being vandalised.

If only he could enjoy the high security provided to his main opponent!