In a Texas-sized spending battle that attracted more than $14 million in outside money, Ted Cruz upset the party establishment favorite Lt. Gov. David Dewhurst in the in the state's contentious Republican primary runoff election for U.S. Senate.
Cruz, a tea party favorite and former Texas solicitor general, beat Dewhurst 55 percent to 45 percent according to partial returns Tuesday night. The race was easily the most expensive congressional primary fight this election.
Dewhurst, owner of an energy company, outraised Cruz 3-1, having brought in more than $33 million -- $25 million from his own pocket. Of that sum, Dewhurst gave his campaign about $8.5 million just in the last three weeks of the runoff.
Cruz raised $10.2 million, with $1.4 million of coming from the candidate.
But super PAC and other outside spending was more balanced and arguably made the difference. Pro-Cruz groups spent about $8 million while pro-Dewhurst groups spent roughly $6.5 million this election cycle.
Cruz and Dewhurst are fighting for the seat being vacated by Republican Sen. Kay Bailey Hutchison.
Pro-Cruz advertisements linked Dewhurst to the Texas GOP establishment, attacking the lieutenant governor's political career and touting Cruz's political inexperience as evidence of principled conservatism.
The runoff attracted more spending than the May 29 primary, where Dewhurst failed to win the majority necessary to avoid a runoff.
Spending by outside groups rose dramatically once it became a two-man race. All outside groups spent approximately $6.5 million ahead of the May 29 primary
and about $8 million since.
Cruz, a Harvard graduate and high-profile attorney, outshined Dewhurst's measured delivery in the past two weeks' debates and campaign appearances, according to Southern Methodist University's Cal Jillson.
"Cruz is a very articulate lawyer," Jillson said. "The debates between the two have shown Cruz at his best."
The anti-tax group Club for Growth Action spent more than $5.5 million to help elect Cruz, far more than it has spent on any race thus far, nearly all of it ripping into Dewhurst.
Jillson said a tea party win would likely send a message to Republican elected officials in Texas: "scoot to the right."
Reporter Michael Beckel contributed to this report.