Challenges to voters are growing before the midterms -- and have a long history as a way of keeping down the Black vote

A GOP plan means that voters may be challenged on their right to vote. Matthew Hatcher/Getty Images

Voters who want to cast their ballot on Election Day this November may be in for an unpleasant surprise – the very real possibility that they will be unable to vote.

That’s because any registered voter can challenge the right of another voter, or group of voters, to cast a ballot by alleging that they are not qualified to do so.