Mike Castle, a Republican moderate who championed creating the popular 50 State Quarters Program of commemorative coins while he served in Congress, has died. The Delaware Republican Party announced that Castle died Thursday in Greenville but shared no other details. His signature issue in Congress was the commemorative quarters program that featured coins honoring each state, starting with Delaware. He also helped establish a similar program honoring U.S. presidents with dollar coins, beginning in 2007, and an "America the Beautiful" quarter program honoring national parks, monuments and nature areas starting in 2010. Castle had been a state lawmaker and lieutenant governor before becoming governor in 1985.