Washington (CNN) - Just got off the phone with top Democratic strategist Steve Elmendorf, and like other White House allies I've spoken to today he's just positively euphoric the morning after the choice voters now have in Delaware after Tea Party favorite Christine O'Donnell's stunning Tuesday night victory in the Republican Senate primary.
"The Republicans basically gave away a Senate seat," Elmendorf practically yelled into the telephone. "This woman can not win. Just look at the tone of what the NRSC and Karl Rove said."
Indeed, the National Republican Senatorial Committee says it will not give O'Donnell any money after she knocked off their preferred candidate, moderate Rep. Mike Castle. And Rove is suggesting O'Donnell has "serious character problems" that will likely throw Vice President Joe Biden's old Senate seat into the hands of Democratic nominee Chris Coons.
Top White House aides largely agree with Elmendorf - and oddly enough Rove too - that Democrats have just taken back a Senate seat that was probably lost if Castle had won the primary. He had been elected statewide about a dozen times as governor and Congressman, while O'Donnell is a wild card.
More importantly, White House aides feel this plays right into the narrative the President has been pushing about a choice between his policies (progress) and the Republican policies ("failed policies of the past," he claims).
"It's really got to tell you something that Karl Rove is saying Christine O'Donnell is too conservative for Delaware," said a senior administration official. "The fact that Mike Castle is now too conservative for the Republican party - it's a crystal clear signal there's no room for moderates in that party."
A second senior administration official added this only helps Obama "shape our message" that the election is a choice - the word the President has used over and over - between two vastly different approaches to fixing the economy and other critical issues.
But this second official cautioned that Democrats should not get overconfident because O'Donnell can survive without money from the NRSC and the rest of the party establishment because "she'll be able to fundraise" big time from conservative activists who are motivated to help.
"That can't be underestimated," this second official said of her influence with Tea Party supporters.
But Elmendorf said the difference is that while the Tea Party had vast influence to help O'Donnell in the more narrow Republican primary, the general election will be different because Delaware is a place where moderate candidates like Castle and Sen. Tom Carper (D) have consistently won statewide.
"This is Delaware," said Elmendorf. "This is not Kentucky."
Elmendorf noted the other benefit of the Delaware results is that it helps energize the Democratic base, which has only recently started getting excited about the election. "The juices don't start flowing until after Labor Day," he said.
Elmendorf said that as Republicans continue to nominate extremely conservative candidates, it helps make the President's case that there is a wide gulf between his agenda and that of House Minority Leader John Boehner (Ohio) and other Republican leaders.
"As we get closer to the election, people will realize this is a choice," said Elmendorf. "[Obama] may not be perfect. We may not have gotten everything we wanted. But the alternative is really bad."
Music to the ears of White House aides I've spoken to today.
"This is not a one-race phenomenon," one senior administration official said of Tea Party-backed candidates winning the Republican nomination in Senate races from Kentucky to Colorado and Alaska. "It's pretty clear that's where the energy is for Republicans. The question is if that's in the mainstream of where the American people are."
The senior official added, "The good thing is now there's a clear choice among voters. It just becomes more clear. And we think we're going to win a lot of these races" where there's a clear choice.
Get used to hearing that word - choice - the President will be using it over and over in the final stretch.