O'Donnell's victory has divided Republicans, many of whom doubt that the far-right candidate can win in November:
In Delaware, Mr. Castle, a moderate who served two terms as governor and had been reliably winning elections for the last four decades, became the latest establishment Republican casualty. Republican leaders, who had actively opposed Ms. O’Donnell, said the outcome complicated the party’s chances of winning control of the Senate.
...Ms. O’Donnell, a former abstinence counselor who had failed in previous attempts to run for office in Delaware, won the endorsement of Sarah Palin, Senator Jim DeMint of South Carolina and other leaders of the party’s conservative wing.
Her success touched off a new round of recriminations among Republicans over the direction of their party, raising the question of whether there was still room for moderates and whether the drive for ideological purity would cost the party victories in November. The state and national Republican Party had mounted an aggressive campaign to defeat Ms. O’Donnell...
...“There’s just a lot of nutty things she’s been saying that just simply don’t add up,” Karl Rove, the Republican strategist, said in a television interview on Fox News. “...In my opinion, this is not a race we’re going to be able to win.”
O'Donnell's work as "a former abstinence counselor" and Rove's reference to her saying "nutty things" bring to mind her extreme views on sexuality. Rachel Maddow showed footage of O'Donnell's 1996 comments against masturbation on MTV's "Sex in the 90s" show (h/t Talking Points Memo). Watch: