WASHINGTON — As the effect of a new law protecting the rights of overseas U.S. voters is felt, those voters are reporting an easier time in requesting and receiving ballots. But a very substantial number of their ballots still went uncounted in the 2010 midterm elections, according to a private foundation. “There was definitely an indication from the voters themselves that there was improvement,” Claire M. Smith, research director for the Overseas Vote Foundation, said Thursday in explaining the group’s findings. “One voter said, ‘For the first time in 34 years, I got my ballot on time.”’ Improved procedures received...