An election official collects mail-in ballots after they have completed a process that verifies each voter's signature on the outside -REUTERS

An election official notes the weight of a ballot box as a means to estimate the number of ballots locked inside before they are processed and counted in Denver, Colorado, -REUTERS

Dana Clark and her 18-month-old son Mason wait in line at city hall as early voting begins for the upcoming presidential election in New Orleans, Louisiana, -REUTERS

Democratic poll observers Mark Brandfonbener and Valerie Vidal observe early voting at a polling site at the Milwaukee Public Library's Washington Park location in Milwaukee, Wisconsin, -REUTERS

Election official Mary Jo McDonald helps a voter at a polling site at the Milwaukee Public Library's Washington Park location in Milwaukee, Wisconsin, -REUTERS

Election officials in Denver are required to wear buttons indicating their party officiation or if they are unaffiliated while processing and counting ballots in Colorado, -REUTERS

Election officials run mail-in ballots through a process that verifies each voter's signature on the outside of the envelope with the one on file at the Denver Election Division in Colorado, -REUTERS

Inmates take part in early voting for the upcoming election at Cook County Jail in Chicago, Illinois, -REUTERS

Jane Baugh of St. Petersburg, a Donald Trump supporter, waits in line at the Supervisor of Elections Office polling station as early voting begins in Pinellas County in Largo, Florida, -REUTERS

People line up at the John F. Kennedy Library polling station in Hialeah, Florida, -REUTERS

Vehicles drive through to drop off their mail-in ballots at the Registrar of Voters for San Diego County in San Diego, California, -REUTERS

Vice President Mike Pence, and his wife, Karen , -REUTERS

Vice President Mike Pence, and his wife, Karen, arrive to cast their ballots in Indianapolis, Indiana, -REUTERS

Voters wait in line to enter a polling place in Durham, North Carolina, -REUTERS

Wilner Rejouis exits the North Miami Public Library polling station in Miami, Florida, -REUTERS