Many New Hampshire voters will be casting ballots on scanners that are at least 15 years old — with some potentially dating back to Bill Clinton’s presidency. Election experts say the aging AccuVote ballot tabulators in use across roughly half the state’s towns and cities don’t pose additional security risks. The concern is their age. With a dwindling supply of replacement parts, breakdowns would create headaches for local election officials during Tuesday’s first-in-the-nation primary. That could force them to count ballots by hand and lead to delays in reporting results. Malfunctio...