ATLANTA (AP) — Political activist Leah McElrath was reviewing her electronic ballot at a polling place in Houston when she was shocked to find Republican Ted Cruz listed as her choice in Texas' high-profile U.S. Senate race.

McElrath had voted a straight ticket for Democrats, but the machine had switched her vote in the Senate race to Cruz, the incumbent. She snapped a quick photo, which she later posted on social media after seeing others making similar complaints.

"The main thing isn't why it's happening — if it's malice, malfunctioning or poor design," McElrath said. "It just needs to stop....