[KR] This article (referencing the most recent Pew survey) suggests that perhaps neither party may benefit from the immigration issue since there is a decline associated with both parties on immigration policy issues among Latinos.
“You have a lot of undocumented whose kids are U.S. citizens. You’re not just reaching out to this generation, you’re reaching out to the following generation,” said John Perez, 50, a third-generation Mexican-American who leads the Hispanic outreach for Republican Kenneth Blackwell’s campaign for Ohio governor.

Communication with the segment of Hispanics who are citizens and registered to vote isn’t difficult because they often can be reached through Spanish-language media, festivals and Hispanic businesses, Perez said.

Blackwell’s opponent, Democrat Ted Strickland, has been canvassing in Hispanic neighborhoods and festivals and taking care to provide Spanish-language versions of campaign literature, campaign spokesman Isaac Baker said.

[..]

A June poll by the Pew Hispanic Center found that 16 percent of Hispanics support Republicans on immigration, down from 25 percent two years ago. Support for Democrats on the issue fell from 39 percent to 35 percent.

AP Story