Since 1984 the Portland Marathon Clinic (PMC) has prepared local runners for the Portland Marathon. But this summer, for the first time since Patti and Warren Finke founded the Clinic 35 years ago with the official support of the Portland Marathon, there will be no PMC. Even without the Clinic and the free Saturday runs, though, I’m confident that the PMC’s influence on marathon training will continue to be felt by Portland runners. “I speak…