However, registered Democrats will have their votes challenged.

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This is a tv news story that was not written in paragraph form. I'm not posting the entire article, only significant sentences.
http://www.wtov9.com/news/9844272/detail.html
A rare event will take place in the Ohio Valley on Thursday, a special election to find out who will take Rep. Bob Ney's seat in the 18th Congressional District.

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And if you're a registered voter, make sure you bring your wallet.

"Tomorrow, for the first time we're going to ask to see some identification," said Mctegue.

Ironically, bringing identification to cast a ballot is a change Ney pushed for as part his push for election.

But the biggest hurdle for the Republicans is time.

Whoever wins Thursday will only have two months to campaign.

The Democrat running, Zack Space, has had a big jump start.

Any registered voter can cast a ballot in the special election.

However, registered Democrats will have their votes challenged.