Houston, Texas – On January 18, Arizona Senator Kyrsten Sinema cozied up to fossil fuel execs at Houston's exclusive River Oaks Country Club. The next day, she voted against filibuster changes necessary to pass voting rights legislation.

Sinema earned the ire of fellow Democrats last month after announcing she would not support any changes to Senate filibuster rules, which require 60 votes to pass most legislation.

Her refusal – together with that of West Virginia Sen. Joe Manchin – tanked her party's agenda to expand ballot access, even as Republicans are dead set on removing the few protections that remain for Black and brown Americans.

The news that Sinema was fundraising among fossil fuel bigwigs, many of whom are Republicans, one day before electing to undermine voting rights becomes even more stark in light of the details revealed by a Guardian report.

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During that event, she is said to have told the mostly Republican attendees they could "rest assured" she would not support filibuster changes.

"Sinema isn’t up for re-election this year, but she’s fundraising full-tilt," OpenSecrets Executive Director Sheila Krumholz told the outlet. "By her comment to oil-industry attendees last week, she clearly knew her vote to protect the filibuster would please them."

Krumholz added that the event "seems well timed as Congress revisits the $550-billion [Build Back Better] measure focused on climate change provisions, where her vote could help industry minimize new regulatory and tax burdens."

Those corporate execs do seem pretty pleased with the senator, as she is expected to generate tens of thousands in donations from that event alone.

But Sinema's constituents don't seem to share those good vibes. Her approval ratings among registered Arizona Democrats have dropped from 70% in 2020 to just 8%.

Sinema is apparently hoping that having enough money in her campaign coffers will outweigh her unpopularity when she is up for reelection in 2024.

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She "clearly understands the electoral position she is in, and is using this opportunity to raise as much as she can in order to make challenging her a herculean task – whether she runs as a Democrat or an independent," said Arizona Republican consultant Chuck Coughlin.

Sinema reportedly had $4.4 million in her war chest at the end of the September.

But the senator isn't the only one raising money. A group called the Primary Sinema Project is also fundraising to support a Democratic challenger in 2024 – albeit from very different donors.

The Primary Sinema Project reportedly received at least $330,000 since last summer, including an influx of $100,000 In the week after her filibuster speech alone.