Although they all back the Arizona measure, the Republican Senate candidates have nuanced differences of opinion on other aspects of the immigration debate.
All three have called for increased security along the border and extending the border fence, as well as the creation of a guest-worker program.
Campbell and Fiorina have refused to discuss whether millions of illegal immigrants in the U.S. should be offered a path to citizenship, arguing that the federal government must first secure the border.
DeVore, more bluntly, said illegal immigrants seeking citizenship "need to leave the country, get a visa, reenter the country and then stand in line behind those that have been trying the right way to come in."
"I think the people that decide not to go this route are in all likelihood criminal aliens that don't want to reveal themselves, and those individuals would be much easier to find and deport," DeVore said.
The first face-to-face debate featuring the three candidates will be taped Thursday night for viewing at 11 a.m. Sunday on ABC stations in California.