Never underestimate the Hispanic vote. Hispanics are neither monolithic in their vote, nor are they stupid. They do not easily dismiss lies and being patronized. They also have long memories of who helped them as a people, and who hindered them.
Importantly, they are not of one mind about illegal aliens, which is a bad assumption some candidates make.
Unfortunately, this is much less true about Mexican and Mexican-American voters. They are very "conservative" in their voting patterns: If Grandfather voted straight-ticket PRI for 60 years (and the huge majority of them did: nobody ever even heard of Vicente Fox's norteno PAN party until about 25 years ago), then so did his son, and when his son came to America, he voted straight-ticket Democrat (70/30 split or better is typical, in favor of Dems), and that man's son in turn votes Democrat, as will his grandson and his grandson's son. So say sociologists and PoliSci people who've studied the Mexican-American political folkway.
Central Americans are a completely different matter; they and South Americans split their tickets, and they helped George W. Bush get to 40% of the "Hispanic" vote in Texas, despite the bloc-voting of the Tejano Democrats.
The Texas and national Democratic parties are heavily invested in the Tejanos; if they can flip Texas, they'll hold the White House for the next 200 years.