Why are Dems on local election boards limiting early voting hours?

The Wautaugawatch blog asks a good question.

As Pat McCrory so memorably said, Early Voting has been "compacted." Though the number of days of Early Voting has been reduced from 17 to 10, the total number of hours that polls were open during Early Voting in 2012 must be duplicated in the shortened Early Voting period of 2014, unless an individual county board of elections unanimously requests an exemption from the rule.

So why did the Dems in 32 local election boards vote to reduce the number of early voting hours?

The complete list, as given at the blog:

Alleghany
Bladen
Brunswick
Buncombe
Caldwell
Camden
Cherokee
Chowan
Clay
Craven
Currituck
Duplin
Graham
Granville
Greene
Henderson
Martin
McDowell
Mitchell
Onslow
Pamlico
Pasquotank
Perquimans
Sampson
Stokes
Surry
Tyrrell
Warren
Washington
Wilkes
Yadkin
Yancey