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Rep. Joaquin Castro, who represents the 20th Congressional District in Texas, said doctors discovered tumors in his gastrointestinal tract last summer, and he had them removed Monday.
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In a night full of jokes and mockery, Vice President Joe Biden took some time to seriously critique this year's presidential election.
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NPR's Ari Shapiro interviews Rep. Joaquin Castro of Texas about how things are looking for Hillary Clinton on Super Tuesday. She is projected to win the Democratic primaries in Virginia and Georgia.