Officeholders in AZ can be recalled if a petition garners signatures equivalent to 25% of the votes cast in the last election for that office, which in this case would be about 596,000 signatures. If this poll is even remotely accurate, the AZ Dems should be able to get that easily. If I were Ruben Gallego or someone connected to him, I'd quietly get an effort organized to recall her.
Sure that this applies to federal officeholders? I would assume it just applies to state level and local officials.