WASHINGTON (Reuters) - Arizona state officials have asked the U.S. Department of Justice to investigate a case of possible voter intimidation when a group of people followed a voter in Maricopa County dropping off a ballot at a drop box for the upcoming midterm elections. Reuters reported earlier in October that many incidents of alleged voter intimidation are being carried out by an expanding group of thousands of grassroots poll observers, many of whom have been recruited by prominent Republican Party figures and activists, a trend that has worried elections experts and officials. In dozens of cases throughout the country,...