The primary election to determine who will be the Democratic and Republican nominees to succeed longtime state senator Robert Hedlund is today. 
The Democratic candidates are Joan Meschino, a former Hull selectman, and current Hingham Selectman Paul Gannon.
On the Republican side, the candidates are former Hull resident Stephen Gill, who is now a Scituate attorney, and former Hedlund legislative director Patrick O'Connor, who is also Weymouth's council president. 
Polls at the Memorial School on Central Avenue are open until 8 p.m.