After Iowa and New Hampshire, it's on to South Carolina and Nevada.
Republican voters will head to the polls in South Carolina on Saturday, while Democrats in Nevada will caucus for their preferred candidate.
On both sides, the insurgent "outsider" candidates are trying to sustain huge streaks of momentum off impressive wins in the New Hampshire primaries.
Republican candidate Donald Trump and Democratic hopeful Bernie Sanders both notched double-digit victories after narrow losses in the first-in-the-nation Iowa caucuses.
Now, Trump is looking for a defining victory in the Palmetto State, while Sanders is trying to prove he can challenge Democratic front-runner Hillary Clinton in a state whose electorate is more favorable to the former secretary of state.
With all that in mind, we take another look at who has the best chance of making it to the White House to succeed President Barack Obama.
Our rankings are based on the Real Clear Politics averages of national polls and those in the states of South Carolina and Nevada. We also factored in the candidates' delegate count and their finish in Iowa and New Hampshire, as well their momentum (or lack thereof) over the past few weeks.
Since New Hampshire, two more Republican candidates have dropped out of the race: former Hewlett-Packard CEO Carly Fiorina and New Jersey Gov. Chris Christie.
Here's a look at where all the candidates stand.
All poll results as of Thursday.
And to the polls: Here's a look at where the candidates stand in their respective parties when combining their delegate totals and their standing in national, South Carolina, and Nevada polls.