Steve Sailer's post below, quoting  the LA Times's Presidential campaigns missing the mark in advertising to Latinos, is 1267 words long, so you may have missed this part, at the very end:

Here's a more interesting part of the article:

Perhaps the Romney campaign is paying close attention to studies that show advertising in Spanish can turn off white and black voters. When white and black audiences saw ads with a Latino endorsement or in Spanish, their support for a candidate dropped, said Ricardo Ramirez, a professor of political science at Notre Dame. 

"We know that appearing more inclusive by outreaching toward Latinos seems to work well for immigrants, but it seems to have a negative impact on blacks and whites," he said.

Who make up close to 7/8ths of the voters.