10 key demographic groups that could decide the presidential election

From voters young and older to the potentially very wide gender gap, here's what to watch for as the election results come in.

10 key demographic groups that could decide the presidential election
Voters line up to cast their ballots at the Stamford Government Center on the first day of early voting on Oct. 21 in Stamford, Conn.

From voters young and older to the potentially very wide gender gap, here's what to watch for as the election results come in.

(Image credit: John Moore)