While the Republicans liked to trot out speakers with accents (as well as instructing every speaker to point out their immigrant heritage - like most Americans have) very little was said about immigration policy. Though when the subject came up, it was usually to bash immigrants - Rick Santorum I'm talking to you.
The Democrats, on the other hand, have no qualms getting specific in promoting immigration reform, touting the DREAM Act and DACA and reminding voters that there is only one pro-immigration party. And before readers chime in with "Romney likes legal immigrants" I am talking about the fact that nearly all of the anti-immigrant loudmouths in Congress are Republican (including almost all members of the anti-immigrant Immigration Reform Caucus), the RNC platform was basically written by Kris K(?) Kobach and Mitt Romney himself is the father of the concept of self-deportation. And Republicans like Charles Grassley are always there blocking legal immigration reform measures.
The Dems, on the other hand, gave the choice keynote speaker spot to up and comer Julian Castro, the young Latino mayor of San Antonio. It's party platform embraces broad immigration reforms along the lines of the Bush/Kennedy proposals from the last decade and opposition to draconian state laws like Arizona's SB1070. Michelle Obama visited the Hispanic Caucus today in Charlotte and reminded delegates of her husband's strong support for the DREAM Act. Tonight DREAMer Benita Veliz will address the DNC during prime time shortly before President Clinton takes the stage. And speaker after speaker has praised the President's deferred action policy as proof of the party's commitment to being pro-immigration.
Romney likely got a small bounce with Hispanic voters last week just based on the fact that they kept immigration out of the spotlight (except to say they like Latinos). But I'm guessing he's even further behind by the end of this week.