As opposed to Christine O'Donnell, who ran against the GOP when she didn't get the nomination. In other words, one reason she can't attack Mike Castle on this point (the way some FReepers would like) is that she did the same thing back in 2006--promise support to the GOP candidate until someone else got it.
Another reason is, of course, that nearly half of Republicans voted against her in the primary, so she needs a lot of the Castle supporters--both GOP and Dem.
Rather than focusing on Mike Castle or Christine O'Donnell, what conservatives need to do is focus on the Joneses...by educating and converting their neighbors, we will have a conservative electorate looking for conservative representation. That's better than trying to push for conservative representation for a liberal populace.
“What conservatives need to do is focus on the Joneses...” How, exactly? How do conservatives finally and successfully do just that, throughout ALL “politically blue areas” of the U.S.? How about doing that in Nancy Pelosi’s Congressional District as well as throughout all U.S. cities? How about doing that in all areas of the U.S. that have been pro-leftist for more than fifty years and making it, actually, work for conservatism and for the long-term?