Democrats Hold Edge on Voter Registrations in Swing States

But GOP is cutting into the margins

Voter registration ended Tuesday in Colorado, Florida and Ohio, three critical pieces to the electoral battleground puzzle, along with a dozen other states.

An aggressive registration push by President Obama's campaign produced Democratic advantages in nearly every swing state where registration is cataloged by political party. But in most states, Republicans are cutting into the Democratic margins that helped sweep Mr. Obama into office four years ago, according to preliminary figures from state election officials.

The closing day of registration lured Mr. Obama and Mitt Romney to Ohio, where voters do not specify a political party, but both campaigns pushed hard to get supporters to register.