This should be no surprise; it would be a surprise, in fact, if the influence business had taken a pass on the lucrative potential of pot. But the flood of former government officials coming into the pot business — including former governor and current presidential candidate William F. Weld, former state House speaker Thomas M. Finneran, former state senator Andrea F. Nuciforo Jr., former Boston city councilor Michael P. Ross and even former Boston police superintendent-in-chief Daniel Linskey — is striking.