He seem maverick enough to get reelected. The Democratic candidates aren't known yet
Garcia is known.
Considering he only very narrowly lost the 2014 AZ School Superintendent race in a Republican favorable year within Arizona, and performed the best a Democrat had performed in AZ CD-'08 (Until the 2018 Special Congressional Election), yeah I would say he is well known, and generally respected even by many Republican and Republican leaning voters in Arizona.... 
To be fair, Diane Douglas was not at all popular back then, and far less so now. She's going to be absolutely smoked in the general this year if she gets past the primary. But yes, Garcia is a very decent candidate, and performed very well in '14, despite not being able to overcome the partisan lean of the state and aforementioned political winds that favored Republicans. Fortunately, times have a-changed, and after the teachers' protests and bolstered Democratic energy on the horizon, Doug Ducey and the rest of the Arizona GOP have a very tough election on their hands.
