Donald Trump and Hillary Clinton are cementing their status as front-runners with strong performances among the demographic groups at the core of their two parties.

Donald Trump speaks during a campaign rally at the Georgia World Congress Center, in Atlanta, Georgia. (Photo by Branden Camp/Getty Images)

It puts tremendous pressure on their rivals heading into delegate-rich March.

Exit polls show a surprisingly strong performance for Trump among Evangelical conservatives in South Carolina, that helped him notch another double digit victory and sweep all 50 delegates.

It was a grave blow to Sen. Ted Cruz, who invested heavily in his pursuit of religious conservatives only to finish a narrow third behind Sen. Marco Rubio.

For Democrats, Clinton's Nevada caucus victory over Sen. Bernie Sanders affirmed her strength among non-white voters, who, like white Evangelicals for Republicans, will play key roles in upcoming primaries.