David Eldridge The Washington Times - September 7, 2010, 06:14PM

Last week, we reported that Rep. Mike Castle was suddenly taking more seriously his tea-party backed opponent in Delaware’s GOP primary for the state’s open Senate seat,

This week, the Castle campaign, which is backed by party leaders in Delaware and in Washington, unveiled its first attack ad on Christine O’Donnell, who has come from nowhere to make a contest out of the Sept. 14 primary.

SEE RELATED:

Here’s the Castle campaign going negative: