[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2010/images/09/14/art.palin.teaparty.file5.cnn.jpg caption =" Sarah Palin and the Tea Party Express have endorsed a number of winning primary candidates."](CNN) - Christine O'Donnell's upset win over Rep. Mike Castle in the Delaware Republican Senate primary is also another major victory for the Tea Party Express and for Sarah Palin.
"I also want to thank the Tea Party Express," said O'Donnell in her victory speech Tuesday night.
The Tea Party Express, a leading Tea Party organization, endorsed O'Donnell on July 21 and spent more than $250,000 to help the once long shot candidate defeat Castle, a brand name in Delaware thanks to two terms as governor and the past 18 years as the statewide congressman.
O'Donnell's victory comes two weeks after Sen. Lisa Murkowski conceded to Joe Miller in Alaska's GOP Senate primary. The Tea Party Express pumped in about $600,000 to help the once unknown Miller edge out Murkowski, part of a political dynasty in Alaska.