Just for everyone to be sure,
if you retrieved the source code from github lately and compiled it, you are automatically voting for merged mining. You can tell by looking at cryptonote_config.h in /src/
SUPPORT merged mining:
#define CURRENT_BLOCK_MINOR_VERSION 1
AGAINST merged mining:
#define CURRENT_BLOCK_MINOR_VERSION 0
That's right. Results will be calculated starting from the moment an explicit voting option will be provided.