No one has ever advocated that I don't vote, and I am a minority (Japanese American).
No mainstream politician- or mainstream wannabe- is going to say that directly. They're smarter than that.
I had a friend who date a dude who worked on David Duke's gubernatorial campaign, so I got a close look at his platform materials. Of the @2 dozen points in his platform, I could refute @20 of his positions with stuff out of freshman college courses. One I couldn't: he was anti-crime, and nobody is going to run on a pro-crime platform. But dig deeper, and his anti-crime measures were aimed squarely at minorities.
So, back to minorities voting.
Even throwing out the Jim Crow and Civil Rights abuses of the more distant past, GOP politicians are more likely to favor and propose measures like requiring ID to vote (usually while simultaneously making valid ID more difficult to get), reducing number of voting days, shortening polling hours, only counting absentee ballots in close elections, voting roll purges, and generally just making it more difficult to actually register in the first place (like opposing motor voter laws).
These are all more likely to suppress minority, youth, absentee (including military) and elderly voting than for middle aged white folks. And "disparate impact" is one of the tests in deciding if a law is unconstitutional.
In addition, said measures rarely have an upside, at least, not the one claimed. Usually, you'll see those regulations proposed to combat voting fraud. Well, in-person voting fraud has been looked at pretty extensively: in the billions of votes cast nationwide in presidential elections over the past few decades, fewer than 3000 cases have been reported in which showing ID would have prevented the alleged fraud- only a couple dozen since 2000. And there have been fewer than 100 convictions.
http://www.washingtonpost.com/news/...le-incidents-out-of-one-billion-ballots-cast/
http://www.politifact.com/georgia/s...acp/-person-voter-fraud-very-rare-phenomenon/
https://www.brennancenter.org/publication/voter-purges
http://thinkprogress.org/justice/20...nds-of-minorities-from-27-states-voter-rolls/
And the cost of those measures? Hundreds of thousands of voters struck from the rolls, hundreds of thousands if not millions more prevented from voting...mostly those who statistically tend to vote against the GOP. Oh yeah- plus hundreds of millions of dollars spent preventing something exceedingly rare.