That doesn't mean that the Democrats have Latino votes sewn up. Latinos vote at lower rates than other groups, and they are more socially conservative than other Dem-leaning groups. However, the Democrats have a lot of positions that Latinos strongly support, like allowing children who came into the country illegally to stay legally, work, and get educated. There's also support for college education such as scholarship aid. After reading a list of Democratic positions and programs that benefit Latinos, it's hard to think that many will vote Republican. Maybe not, but Jorge Ramos doesn't want Dems to take Latinos for granted. That should be a no-brainer for any politician--you don't want to ignore demographics.
Extras: Latinos could turn Texas Democratic by 2030, if (big if) current trends hold. My own thought--could Latinos make the Democratic party more centrist? I'm always hoping for that, so of course they can.