There is no such thing as a Hispanic. There are completely different ethnic, racial, cultural and national groups that were once part of the Spanish colonial empire.
Your point about the diverse culture that our government lumps together as “hispanic”:
You are indeed correct. What is kind of amazing is how cohesive the black community is, given its size. The so-called hispanic community is, as you point out, several identifiable groups. Same thing with the much smaller statistical group of Asians. Even the American Indians aren’t very cohesive.
Being realistic, we’re not going to win a lot of votes just because we nominate an hispanic. Maybe a few. Maybe we’ll get 40 percent instead of 30. It’s a factor to be considered, but there are many other factors.
Over time, we should fetch a growing percentage, regardless of whom we nominate, just because of their ascending the economic ladder. Same thing that happened in the past with the white ethnics (Italians, Poles, Irish and so forth). Nowadays, we don’t even distinguish white ethnics in polls (except indirectly by talking about Catholics).