Clinton hits Scott Walker in his home state

Hillary ClintonHillary Rodham ClintonHouse Judiciary Committee votes to request documents on Comey, Clinton GOP senator warns Trump: Panel won't take up attorney general nominee this year Overnight Cybersecurity: Facebook invests in group fighting election hacking | House panel advances DHS cyber revamp bill | Lawmakers mull cyber insurance for small businesses MORE scored points with the Wisconsin Democratic debate audience by attacking the state's governor, Republican Scott Walker.

Clinton criticized presidential rival Bernie SandersBernie SandersSanders: Dems won't vote on 'sham' single payer amendment GOP Senator forces Dems to vote on single payer Kerry on Trump’s military transgender ban: ‘We’re better than this’ MORE's plan for free college tuition as unworkable, saying it depended on Republican governors like Walker.

"Sen. Sanders's plan really rests on making sure that governors like Scott Walker contribute $23 billion on the first day to make college free," Clinton said.

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"I'm a little skeptical about your governor actually caring enough about higher education to make any kind of commitment like that."

The Milwaukee crowd of Democrats applauded her attack on Walker, who has cut education funding during his governorship.

Democrats and labor groups have been tough critics of Walker, who is known for his hard-line stances against government spending and public sector unions.

Walker, a former Republican 2016 presidential candidate, fired back in real time on Twitter.

"While you took big speaking fees, we froze tuition 4 years in a row to make college affordable. #DemDebate," Walker tweeted, addressing Clinton directly.