When he used the term my support and Arnold's support, the support was the voters that backed them and not anything that either candidate would say or do.
I agree that without the entire context, the statement is open to various interpretaions.
The bottom line being that McClintock's current position is that regardless of what the situation is at any given time, he is not dropping out and is going to leave it up to his supporters to contemplate any change in support without any prompting from McClintock himself.