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Republican presidential candidate Sen. Ted Cruz greets voters during a campaign event Feb. 19, 2016, in West Columbia, South Carolina. Alex Wong/Getty Images

Could the Republican Party finally have a new front-runner? Polls earlier this week ahead of Saturday's GOP primary in South Carolina could not pinpoint who was on top and showed current front-runner Donald Trump’s lead slipping.

An NBC News/Wall Street Journal/Marist poll Friday estimated Trump had 28 percent support, down from 36 percent in January. Following Trump was Texas Sen. Ted Cruz at 23 percent, up from 20. Florida Sen. Marco Rubio garnered 15 percent.

However, other polls had percentages wavering for Cruz, Rubio and Trump, with none of them clearly coming out on top as the primary neared.

A big showing from either Cruz or Rubio supporters could boost that candidate to the top. In the New Hampshire primary earlier this month, Trump took the lead and was followed by Ohio Gov. John Kasich. Kasich and Ben Carson were tied at 9 percent in the Marist poll.

The candidates seem well aware of the pull of undecided voters. Rubio retweeted a South Carolina voter who endorsed him Saturday morning.

Cruz may get a bump from evangelical voters, whom he has been courting at rallies and also targeting with robocalls. “If those people go out and multiply [on Saturday], this Cruz thing is for real,” Walter Whetsell, a GOP strategist in South Carolina who is unaffiliated with the current campaigns, told the Hill.

Phil Robertson, a reality TV star from “Duck Dynasty,” has been campaigning for Cruz in South Carolina and speaking at his rallies. Robertson had said homosexual behavior was sinful in an interview with GQ magazine in 2013.

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Television personality Phil Robertson speaks ahead of Sen. Ted Cruz during a campaign event at the Eagle Aviation Hangar in Columbia, South Carolina, Feb. 19, 2016. Daniel Acker/Bloomberg via Getty Images

Trump is using his own celebrity fame to push for votes. Saturday morning Trump took to Twitter to push #VoteTrump and included direct attacks at Cruz and Rubio.