Texas GOP voters oust Cornyn in Paxton upset

• Trump gave Paxton a last-minute endorsement in the runoff.

What they're saying: "Tonight is the beginning of the fight to preserve every value we hold dear," Paxton told supporters, referring to his upcoming general election campaign against Democrat James Talarico.

• "I've always supported the Republican ticket, and I intend to do so again in this general election," Cornyn told supporters in Austin. "I've said throughout this race that I trust the voters of Texas, and they made their decision."

By the numbers: With 76% of the votes counted at 10pm, Paxton was up 28 percentage points over Cornyn.

• The AP called the election in favor of Paxton an hour after polls closed Tuesday.

Zoom in: Paxton successfully cast the race as a referendum on the party establishment, energizing grassroots conservatives while dodging concerns about the legal scandals and impeachment fight that dogged much of his tenure as attorney general.

• The race became one of the country's most closely watched Senate primaries, fueling millions in fundraising and outside spending.

What we're watching: Cornyn and his supporters warned that the outcome could complicate Republicans' efforts to hold the seat in November against Talarico, a state representative from Austin.

• Paxton's win gives Democrats a potentially more polarizing Republican opponent than Cornyn.

Reality check: A Democrat hasn't won a statewide office in Texas in more than three decades.

Go deeper: Trump's ruthless midterm power play

Editor's note: This story has been updated throughout with new information.