The GOP source did not have specifics on when Castle's team would conduct the poll, but viewed it as a practical step even if the nine-term congressman was unlikely to re-enter the race.
A spokeswoman for Castle, who put the chances of him running as a write-in "under 5 percent," said her boss likely wouldn't settle on a final decision before next week. According to the state Elections Commission, Castle would have to complete a form by next Thursday to officially qualify as a write-in candidate.
Said Castle spokeswoman Kate Dickens: "A lot of encouragement has come in, nice calls from people in Delaware who want an independent voice."
Even Democrats, it seems, have been urging Castle to run a second campaign:
Delaware GOP National Committeewoman Priscilla Rakestraw said she has fielded dozens of calls over the last 48 hours, mostly from Democrats, about a potential Castle write-in campaign.
"They want to organize a write-in campaign. I'm stunned. Obviously, they don't like their option of voting for Chris Coons. I pass them along to Mike Castle's organization. I think they are waiting for a nod from Castle," Rakestraw said.
Rakestraw said that a Castle bid would likely test her loyalties. "Everyone knows of my relationship and loyalty to Mike Castle. I make no secret of that. I might have to make a tough decision."
While Delaware Republicans still believe the chances of Castle making the leap is unlikely, top GOP leaders in Washington sent a strong message Thursday that they would stay united behind O'Donnell.
"The Senate campaign committee's view is once the nominee is determined, that's who we support," said Arizona Sen. John Kyl, the minority whip.
Read the full story at Politico.
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