Sara Ferguson, one of the teachers who volunteered to work without pay if the Chester Upland School District ran out of money, has been invited to join First Lady Michelle Obama at tonight's State of the Union address, the White House said this morning.

Ferguson, who grew up in Chester, has taught at Columbus Elementary School for 21 years, following in the footsteps of her mother, aunt and grandfather.

Ferguson, 48, and other members of the Chester Upland teachers union said earlier this month they would work without pay when it appeared the district would run out of cash.

Stopgap funding as since been put in place.

President Obama is scheduled to deliver his annual State of the Union address to a joint session of Congress at 9 p.m.