Republicans said they'll be "watching" the political situation in Delaware to decide whether or not to commit resources to GOP nominee Christine O'Donnell.

A senior GOP aide left the door open to the party providing aid to O'Donnell, the conservative insurgent to win an upset primary victory over Rep. Mike Castle for the Republican Senate nomination, as Fox News reported that that the National Republican Senatorial Committee (NRSC) wouldn't be backing the party's nominee.

"We will be watching Delaware just as the Democrats are apparently watching Ohio, Florida, Indiana, New Hampshire, Arkansas, Illinois and Alaska – all states where the DSCC has not yet confirmed any financial support for their candidates," said the senior GOP aide.

Election monitoring services like the Rothenberg Political Report and the Center for Politics at the University of Virginia immediately shifted their ratings of the Delaware race to favor Democrats in the aftermath of O'Donnell's victory.

National Republicans have openly questioned whether the conservative candidate can win over enough centrist voters in Delaware to win Vice President Biden's former Senate seat this fall.

"There's just a lot of nutty things she's been saying," said former Bush political guru Karl Rove on Fox News. "This is not a race we're going to be able to win."