In the aftermath of the Delaware primary, a report from Fox News indicated that the NRSC wouldn’t support the winner, Christine O’Donnell, which raised howls from grassroots supporters until the next morning, when NRSC chair Senator John Cornyn announced the committee’s full endorsement and support for O’Donnell — including the maximum contribution of $42,000. Since then, O’Donnell has raised over $2 million on her own, so money is no longer the main concern, but the lingering doubt about the commitment from establishment Republicans remains. The new web ad from the NRSC, ironically titled “Prove Them Wrong,” should dispel any further questions about support for O’Donnell, whose image is featured almost precisely at the midpoint of the video:

The Daily Caller has more on NRSC support for Tea Party candidates, which goes beyond video mashups:

Looking at preliminary investments, the NRSC is spending or has spent funds on most competitive U.S. Senate races involving Tea Party-backed Republicans:

—In Kentucky, the NRSC is on the air statewide and has reserved just under $2 million on ad buys for GOP candidate Rand Paul. During the primary, Republican Trey Grayson had the backing of the establishment.

—In Colorado, the NRSC is also on the air statewide in support of Republican Ken Buck, who bested the establishment-backed Jane Norton in the primary. A total of $3.2 million is reserved by the NRSC for ad buys in support of Buck.

—In Nevada, the NRSC has reserved $700,000 in statewide television for GOP nominee and Tea Party-backed Sharron Angle.

—In Pennsylvania, $3 million is reserved for TV for Republican nominee Pat Toomey.

—No airtime has been reserved for Christine O’Donnell in Delaware and Joe Miller in Alaska, but the NRSC has donated $42,600 — the maximum donation allowable under law — to both campaigns.

In a small-market race like Delaware, O’Donnell’s money is probably enough to get a good spread of advertising, and the same is probably more true in Alaska, where Miller probably doesn’t need the help.  The investments in Kentucky and Colorado are indicative of the close nature of those races, and in Pennsylvania perhaps more about the effort to gain a GOP toehold in the state for 2012.  The surprise may be in Nevada, where the race has been a tie for months, and where winning the seat means booting Harry Reid from the Senate.

Mainly, though, this shows that the NRSC has become very sensitive to the grassroots and their anger over a lack of embrace for their candidates, whether perceived or actual.  As Jim Geraghty writes, the NRSC has clearly decided to go all in with the Tea Party.