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But in Phoenix, Ms. Sinema’s office building overlooking the crags of Piestewa Peak in the affluent Biltmore neighborhood has become a magnet for her frustrated supporters.

On some days, people crowd the building pushing Ms. Sinema to support voter rights laws and immigration reform. Other days, student-led groups arrive with banners telling her to do more to curb fossil fuel emissions and climate change.

They criticized her for holding a fund-raiser with business lobbying groups that oppose tax hikes in the Democrats’ main spending bill.

Many of the youngest activists now agitating the loudest against Ms. Sinema said they felt betrayed because she seemed so much like them. At 45, she is practically a teenager by the Senate’s octogenarian standards. She is an Ironman triathlete, the first openly bisexual member of Congress and, as someone who claims no religion, was sworn in on the Constitution rather than a Bible.

“I believed in what it would mean to have a queer representative who believed in the climate crisis,” said Casey Clowes, 29, who has demonstrated outside Ms. Sinema’s offices with the Sunrise Movement, a youth-led group focused on climate change. “I knocked on doors for her. I was an intern for her campaign. I really believed.”

Mary Kay Yearin, a lifelong Democrat who lives in Scottsdale, said she and her wife were frustrated because they believed that Ms. Sinema had not done enough to change policies affecting abortion rights, voter rights and, above all, climate change.

Ms. Yearin worried that a fast-warming climate could soon dry up the Lake Powell and Lake Mead reservoirs that water the West, which would make the state nearly uninhabitable in the summers to come. She said the environmental catastrophes facing the country were too dire for a cautious, incremental approach.