PHOENIX (AP) — Independent Sen. Kyrsten Sinema of Arizona announced Tuesday that she won’t run for a second term after her estrangement from the Democratic Party left her politically homeless and without a clear path to reelection.

Sinema’s announcement comes after Senate Republicans blocked a bipartisan bill to help secure the U.S.-Mexico border and deliver military aid to Ukraine and Israel, which Sinema spent months negotiating. She’d hoped it would be a signature achievement addressing one of Washington’s most intractable challenges, as well as a powerful endorsement for her increasingly lonely view that cross-party dealmaking remains possible.

But in the end, Sinema’s border-security ambitions, and her career in Congress, were swallowed by the partisanship that has paralyzed Congress.

“I love Arizona and I am so proud of what we’ve delivered,” she said in a video posted to social media. “Because I choose civility, understanding, listening, working together to get stuff done, I will leave the Senate at the end of this year.”

Sinema’s decision avoids a three-way contest in one of the most closely watched 2024 Senate races, a hard-to-forecast scenario that spawned fierce debate among political operatives about whether one major party would benefit in the quest for the Senate majority. Most analysts agreed Sinema had faced significant, likely insurmountable hurdles if she’d decided to run.