A new poll is shaking up the high-profile Democratic Primary in Senate District 16, showing St. Petersburg Democratic Rep. Michele Rayner with an early lead over House Democratic Leader Fentrice Driskell. With no Republican currently filed, the Democratic Primary is expected to determine who succeeds term-limited St. Petersburg Democratic Sen. Darryl Rouson in the solidly blue district. The poll, conducted by Clarity Campaign Labs on behalf of F…