Mark Kelly raises eye-popping $4 million in Arizona Senate race

Retired astronaut Mark Kelly’s Arizona Senate campaign announced Wednesday that it has raised an eye-popping $4 million in the first quarter of 2019.

The campaign said its haul was driven by more than 58,000 contributions, 96 percent of which were $100 or less. The average online contribution was $25, Kelly's campaign said.

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“Our campaign is fueled by supporters from all walks of life chipping in what they can because they want a voice in their democracy and they know Mark will be an independent leader for Arizona,” campaign manager Jen Cox said in a press release. “We’re proud of the cactus roots campaign we are building with contributions from each of the fifteen counties in Arizona and without a dime from corporate PACs.”

Kelly has high name recognition as a former astronaut and as husband to former Rep. Gabrielle Giffords (D-Ariz.), who narrowly survived a shooting in 2011. The couple has since been a high-profile duo advocating for gun law reform. 

Kelly is running to face off against Sen. Martha McSallyMartha Elizabeth McSallyBolton emerges as flashpoint in GOP debate on Iran Senate Republicans running away from Alabama abortion law McSally to introduce military sexual assault reform bill MORE (R) to serve the remaining two years of the late Sen. John McCainJohn Sidney McCainPelosi receives John F. Kennedy Profile in Courage Award Romney: Trump 'has distanced himself from some of the best qualities of the human character' MSNBC host: Barr 'the most dangerous person' who works for Trump MORE’s (R) seat. McSally was appointed to the Senate in December after McCain’s death in August, with former Sen. Jon Kyl (R) serving in the interim months.

McSally’s campaign has yet to release its first quarter fundraising haul.

It appears unlikely that the former astronaut will face a serious primary challenge after Rep. Ruben GallegoRuben GallegoDemocrats wary of handing Trump a win on infrastructure Tensions swirl around Iran as administration to brief Congress Tensions swirl around Iran as administration to brief Congress MORE announced last month he would sit out a Senate bid.

Democrats see the Arizona Senate race as one of their top pickup opportunities after Kyrsten Sinema (D) defeated McSally last year in the race to replace the retiring Sen. Jeff FlakeJeffrey (Jeff) Lane FlakeThe Hill's Morning Report - White House, Congress: Urgency of now around budget Jeff Daniels blasts 'cowardice' of Senate Republicans against Trump WANTED: A Republican with courage MORE (R).