Candidates in Illinois’ March 18 primary will have a new voting bloc to court — 17-year-olds. A new law gives 17-year-olds the right to vote in a primary election if they will turn 18 on or before a November general election. Similar initiatives have previously surfaced with no success. This time, a group of students at Stevenson High School led by teacher Andrew Conneen raised the idea. Sen. Terry Link, D-Waukegan, sponsored the bill, which was signed into law in May. The students “were saying …