Republican candidate Ted Cruz is shaking up his campaign staff, while on the Democratic side, Bernie Sanders is focusing his campaign up north following a loss in Nevada.

The Texas senator fired communications director Rick Tyler after he tweeted a video that wrongly suggested fellow candidate Marco Rubio made a negative comment about the Bible. Cruz called the video "a grave error in judgment."

"Turned out the story he sent around was false," said Cruz. "But even if it was true, we are not a campaign that’s gonna question the faith of another candidate."

Rubio fired back, accusing the Cruz campaign of sharing "deceptive and untrue" information. Donald Trump also criticized Cruz on Twitter, saying "More dirty tricks. He got caught in so many lies. Is this man crazy?"

Meanwhile with the Democrats, Sanders brought his campaign to Massachusetts Monday. After losing in Nevada, Sanders is keeping his campaign up north, as Clinton has a stronghold in the south.

Sanders visited South Boston, where he picked up an endorsement from grassroots organization People’s Politics. He also spoke about how different he is from Hillary Clinton and said he was "delighted" that she is adopting positions that he has advocated. Sanders then attended a rally at UMass Amherst.

At his event in South Boston, Sanders said he plans to stay in the race until the end.

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