GOP political strategist Karl Rove Karl Christian RoveSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Chris Wallace: This isn't the GOP convention, 'it's really the Trump convention' Trump decries Democratic convention as 'gloomiest' in history MORE warned on Monday that there's still “a long way to go” for Sen. Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE (I-Vt.) to capture the Democratic presidential nomination, saying Sanders has only captured "one-43rd" of the delegates needed to win.

“They have elected in the three contests thus far a grand total of 101 delegates to the Democratic National Convention," Rove told Fox News anchors Ed Henry and Sandra Smith on "America's Newsroom."

"That's 2.5 percent of the total," he added.

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After the first three Democratic contests, Sanders has won 35 delegates compared to 24 for former South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegBipartisan praise pours in after Ginsburg's death Bogeymen of the far left deserve a place in any Biden administration Overnight Defense: Woodward book causes new firestorm | Book says Trump lashed out at generals, told Woodward about secret weapons system | US withdrawing thousands of troops from Iraq MORE. To clinch the nomination, a candidate must take 1,991 delegates.

"He's got one-43rd of what he needs, and yet we're all of a sudden declaring this contest is all over before 47 other states and the District of Columbia and several other jurisdictions are able to vote," said Rove, the former strategist for President George W. Bush.

Rove also said that Sanders has only won one decisive victory, in Nevada.

“Bernie’s got a lead, the field is splintered. He won Iowa with the lowest percentage of anybody in history and it ain’t even close. He won New Hampshire with the lowest percentage of the vote of anybody in history because the field is splintered," Rove said.

In the Iowa caucuses, Sanders won more total votes than Buttigieg, but the ex-mayor won one more delegate than the Vermont senator.

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Rove also said this Saturday's contest in South Carolina is do-or-die for former Vice President Joe Biden Joe BidenMomentum growing among Republicans for Supreme Court vote before Election Day Trump expects to nominate woman to replace Ginsburg next week Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral MORE.

“He wins South Carolina, he goes into Super Tuesday with momentum. He loses South Carolina, he’s out of the contest,” Rove predicted.

Polls show a tightening race between Sanders and Biden in the Palmetto State.