Wendy Maeda/Globe Staff

Alice Vu, 5, read “The Hungry Kitten,” while waiting outside a polling station on Lexington Avenue in Cambridge.

Jason Reed /Reuters

President Obama sat next to a volunteer as he called other volunteers during a visit to a campaign field office in Chicago.

David L. Ryan/Globe Staff

Mitt Romney waved to a crowd of supporters after voting in Belmont.

Amanda Lucier/The Virginian-Pilot via Associated Press

Students at ODU waited in line to vote at Larchmont Elementary School in Norfolk, Va.

Gretchen Ertl/Associated Press

Senator Scott Brown waved as he got into his pick-up truck after voting in Wrentham.

Suzanne Kreiter/Globe staff

Elizabeth Warren greeted supporters at the Graham and Parks School.

Wendy Maeda/Globe Staff

Lines were long outside a polling station in Boston's Chinatown.

Wendy Maeda/Globe Staff

Voting was brisk as the polls opened at a fire station on Lexington Avenue in Cambridge.

Seth Wenig/Associated Press

A sign directed people to a polling site in a school that is also serving as a donation site for victims of Superstorm Sandy in Staten Island.

Tim Chapman/The Miami Herald via Associated Press

Voters waited in line to cast their ballots in Miami.

Seth Wenig/Associated Press

New York resident Marina Shechtman filled out her ballot.