A federal judge has declined to block the use of Georgia’s electronic voting system in a long-running lawsuit that alleged that the system is vulnerable to attack and has operational issues that could deprive voters of their constitutional rights. The judge found that the activists and individual voters who challenged the state’s voting system did not prove that the problems they identified prevented them from voting, diluted their votes or kept their votes from being counted. She wrote in a ruling Monday that they lack standing to sue and she is unable to consider the merits of their claims.