As voters in 15 states head to the polls this Super Tuesday, former President Donald Trump seems to have a lock on the Republican nomination - with his opponent Nikki Haley trailing in every state.

Ahead of today's voting, Trump already scored victories in eight states while Haley was able to defeat Trump with a 30 point lead in Washington, D.C. The former United Nations Ambassador also won delegates in New Hampshire, Iowa and South Carolina. 

While Haley's chance at receiving many of the 854 delegates up for grabs today remains slim, there are some states where her chances are higher than others. Haley tends to poll better among unaffiliated voters, college graduates, and non born-again Christian populations, according to a data analysis from 538.

"The challenge is that she did everything she could in South Carolina," former Arkansas Governor Asa Hutchinson told CNN's "State of the Union." Unfortunately for Haley, however, victory proved elusive - Trump defeated her by 20 points and won 47 delegates, while Haley won just three delegates in her home state.

Some pollsters predict that Colorado, Massachusetts, Vermont and Virginia could be slightly more competitive for Haley due to their more moderate populations. The population of born again Christians is much smaller in New England and all four states have larger populations of college educated white voters, according to 538.

While the demographics of these states might save Haley from an embarrassing defeat, victory still remains unlikely. The University of New Hampshire's most recent polling in Vermont shows that Trump is leading Haley by 30 percentage points. In Massachusetts. Trump is up by more than 30 points, according to a 538 analysis of several polls. Trump has a similar lead in Virginia, while there have been no polls in Colorado for months.

Colorado voters have rejected Trump-aligned candidates in recent Republican primaries but the state's Republican Party has already endorsed Trump in this election. Haley might have a better shot at victory in the Rocky Mountain State than anywhere else but her chances still remain slim.

In the past, Haley promised voters that she would remain in the race until Super Tuesday - but today's voting could mark the end of her presidential campaign.

"[Her campaign has] got to accelerate because you run into the delegate wall. And the delegate wall is March 5," Hutchinson told CNN. "So she's got to prove herself."