As polls opened across the country, residents of several states were contending with severe weather conditions that could affect voter turnout.
A line of storms moved through the Deep South overnight and early Tuesday morning, knocking down trees and power lines from Louisiana to South Carolina. There were no serious injuries, but an estimated 11,000 residents were left without electricity.
A separate storm front in central Tennessee killed one person, injured two others and left thousands without power.
The National Weather Service warned of a possibility of high winds, severe thunderstorms and possible tornadoes Tuesday around Baltimore, Washington, D.C., and the Mid-Atlantic region.
Dry weather was forecast for the West and Southwest, but significant snow accumulations were expected across the northern Rockies.