4. The role of immigration
Yes, Iowa is a landlocked Midwestern state that doesn't share a border with another country. Nevertheless, illegal immigration emerged as a vital issue among voters. In Western Iowa, Representative Steve King has consistently railed against illegal immigration. In an Eastern Iowa Congressional primary last year, illegal immigration became such a heated topic one candidate filmed a commercial at the Mexican border. The candidates' stances on illegal immigration may help drive turnout in some precincts -- and the results may indicate whose message resonates best with voters.At right, the border in San Diego.
(AP Photo)

Text by James Pindell and Jason Tuohey

