WSJ on 4 Year Old Kindergarden

The Wisconsin State Journal Editorial Page addresses 4 year old kindergarden:

Early childhood education works: Children in a Madison kindergarten program for 4-year- olds made substantial literacy gains during the pilot project’s first year, UW- Madison researchers say.
But if financial realities don’t prevent more kids from reaping the clear and obvious benefits of 4-year- old kindergarten, it seems that union rules will.
The pilot project, which continues this school year, served just 33 students last year at Glendale Elementary School and another 17 students at a Head Start site on Lake Point Drive. UW- Madison researchers Arthur Reynolds and Beth Graue said children in the pilot program learned letters and words faster than would be expected by maturation alone. The findings provide a strong basis for expansion of the program.