Hillary Clinton Hillary Diane Rodham ClintonWhat Senate Republicans have said about election-year Supreme Court vacancies Bipartisan praise pours in after Ginsburg's death Trump carries on with rally, unaware of Ginsburg's death MORE and Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE apparently did not shake hands or acknowledge each other after a contentious two-hour debate in Brooklyn on Thursday night.

After the presidential candidates delivered their closing remarks, CNN lingered on them as they stood at their podiums, collected their notes and eventually drifted off stage.

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The months-long primary has begun to strain the relationship between the candidates and their campaigns.

The Clinton campaign believes it has amassed a big enough lead in delegates that winning the nomination is only a matter of time. As such, it believes Sanders should rein in his attacks so as not to damage the eventual nominee.

But Sanders is emboldened by having won eight of the last nine contests, and has vowed to continue fighting all the way to the convention.

Both campaigns have been irritated with the other's attacks and counterattacks.

Clinton's team was angered by Sanders's remarks last week that she was unqualified to be president. On Thursday, Sanders dealt with the fallout from comments by a surrogate who appeared to describe Clinton as a "corporate whore."

Sanders has been angered by remarks Clinton and her campaign have made that he believes took his positions out of context. He was also irritated by arguments the Clinton team made that suggested he was not ready for the Oval Office.

The anger and ill feelings between the two was evident throughout Thursday's two-hour debate.

Sanders returned to questioning Clinton’s judgment and hammered her as an establishment figure who is in the pockets of special interests.

Clinton seemed exasperated by Sanders, repeatedly imploring voters to hold him accountable for how he’d achieve his campaign promises.