In one of the the final contests before Super Tuesday, Mitt Romney is expected to walk away with all 29 Republican delegates from the Grand Canyon state.
Like Florida, Arizona is also an all-or-nothing state for GOP delegates, and could provide Romney with a substantial lead. Going into primary day, the latest polls showed Romney leading in Arizona with 41.6 percent of the vote. Santorum was polling in second with 27.6 percent of the vote, while Gingrich and Paul trailed with 16.9 percent and 9.2 percent of the vote, respectively.
The contest could be a sign of the former Massachusetts governor's strength in the West, an area that could propell Romney towards eventual nomination. Arizona Gov. Jan Brewer (R) gave him her endorsement this past weekend.
The race in Michigan however, hasn't been as clear-cut. A surging Rick Santorum has given Romney, who was born in Detroit, a run for his money in the Midwest. A win for the former Pennsylvania senator there could rattle Romney's campaign.
For full coverage of the Arizona and Michigan primaries, be sure to check out our liveblog. You can also see real-time results of the contests as they come in, district-by-district, below.
Map credits: Jay Boice, Aaron Bycoffe, Daniel Lee, Christian Rocha and Andrei Scheinkman. Data provided by the Associated Press.