Gov. Matt Blunt and Attorney General Jay Nixon both say they will refund the money that they received above Missouri's campaign-contribution limits.
Their announcements will mean a multi-million-dollar subtraction from their campaign accounts for the governor's race in 2008.
A law that took effect in January repealed Missouri's campaign-contribution limits. The Missouri Supreme Court reinstated the limits this summer and directed the Ethics Commission to enforce its ruling. The Ethics Commission gave candidates a deadline of Monday to decide whether to refund the excess contributions or seek an exemption on grounds that returning the money posed a hardship.
Blunt will have to return nearly $4.5 million. Nixon will have to give back more than $1.3 million.