A write-in candidacy by Rep. Mike Castle, a moderate Republican, in the Delaware senate race could hurt Democratic candidate Chris Coons, though apparently not enough to really help Republican candidate Christine O’Donnell, according to a Rasmussen Reports poll released Monday.

O’Donnell, a Tea Party candidate who beat Castle in the GOP primary earlier this month, trails Coons by 9 points, according to Rasmussen’s poll of 500 likely voters in Delaware.