Democratic presidential front-runner Hillary Clinton Hillary Diane Rodham ClintonHillicon Valley: FBI chief says Russia is trying to interfere in election to undermine Biden | Treasury Dept. sanctions Iranian government-backed hackers The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters FBI chief says Russia is trying to interfere in election to undermine Biden MORE took a shot at rival Bernie Sanders Bernie SandersMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters Why Democrats must confront extreme left wing incitement to violence MORE ahead of the Wisconsin primary on Tuesday, saying it’s “important” to choose a Democrat as the Democratic presidential nominee.

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"I … have been a proud Democrat all my adult life," Clinton said at a rally late Saturday in Eau Claire, Wis. "And I think that is kind of important if we are selecting someone to be the Democratic nominee of the Democratic Party."

Clinton and Sanders, an independent Vermont senator who caucuses with Democrats, are in a tight race in Wisconsin. Sanders holds a slight edge, 46.8 percent to 44.5 percent, according to a RealClearPolitics average of polls.

Sanders campaign spokesman Michael Briggs told The Wall Street Journal that Sanders is a “a lifelong progressive who has caucused with the Democrats since he came to Congress.”

Briggs also noted Sanders’s efforts to elect President Obama and work to raise funds for Democratic candidates.

“And, oh yeah, he didn’t support Barry Goldwater for president,” Briggs added in a shot at Clinton.