After the stunning primary loss, Castle's campaign also said the longtime congressman is not interested in waging a write in bid this November.
In Alaska, Sen Lisa Murkowski (R-Alaska) is contemplating an independent write in campaign after she lost to Tea Party backed Joe Miller in the August GOP primary.
As to whether the national party would back O'Donnell, a Castle campaign source said the campaign has no knowledge of their thinking but said "they should save their money."
Read the full story at The Hill.
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