Gov. Pat Quinn signed into law today a measure that would allow 17-year-olds to vote in party primary elections if they turn 18 before or on the date of that year’s general election. The Democratic governor signed the bill at Adlai E. Stevenson High School in Lincolnshire, where civic faculty and students pushed the legislation. Quinn said Illinois joins at least 20 states that set younger age limit for primary voters, citing a national voting advocacy group. Sponsoring Rep. Carol Sente, D-Vernon Hills, said in a statement that the measure was “only fair” since 18-year-olds “are already voting for candidates...