Hillary Clinton takes a selfie – not her first or last.
Scholars studied every tweet sent and Facebook post made by Hillary Clinton and Donald Trump since before the primaries. Here's what they learned about issues and negativity.
Hackles raised at a Rubio rally.
EPA/Erik S. Lesser
In times of trouble, the Republicans have held together by refusing to attack each other. That's all gone out of the window.
Kasich wins one! Now what?
A brokered convention just got more likely for the Republicans.
Could the Republicans' biggest nightmare finally be about to come true?
Trump after learning of his victories in Michigan and Mississippi.
Trump's momentum is unchecked by establishment critics, Sanders surprises in Michigan and other key takeaways from the voting on March 8.
Hillary Clinton with Cecile Richards, President of Planned Parenthood Federation of America.
Democratic candidates support access to contraception, while candidates from the Republican Party favor policies that could severely restrict access to contraception.
Trump versus Clinton – who would win?
Reuters/Scott Audette (L), Javier Galeano (R)
Using a new model that considers state-by-state polling, statisticians from Oklahoma State look at who would win the presidential election if it were held today.
Should college be free for all?
Presidential candidates such as Hillary Clinton and Bernie Sanders have proposed a debt-free or a free college education. Is this feasible? Should wealthier students get such subsidies?
The Ivanpah Concentrating Solar Electric Generating System, built on public land in California’s Mojave Desert.
ATOMIC Hot Links/Flickr
The U.S. energy system is gradually transitioning away from fossil fuels and toward renewables. Will the next president speed up America's shift to renewable energy or step on the brakes?
Donald Trump speaks out against the Iran nuclear deal.
The candidates differ on Middle East policy sometimes a lot; other times not so much. But whoever becomes president, there is no way that America will stop obsessing about the region.
Trump certainly thinks his will.
There's nothing as certain as death, taxes and a Republican with a plan to cut them. But how do the candidates' proposals stack up?
A young Bernie Sanders supporter wears his heart on his sleeve.
Our global newsroom responds to the Super Tuesday primary results in the race for the Republican and Democratic presidential nominees.
They sure did.
EPA/J Pat Carter
One outsider movement candidate ran riot, while another seemingly crumpled.
The world is watching.
It's easy to dismiss the Republican contest as a parochial brawl, but one of its belligerents could be the world's most powerful person.
Marco Rubio, Donald Trump and Ted Cruz speaking over each other at the debate.
The 10th Republican debate offered a chance for establishment candidates to slow Donald Trump's momentum just five days before Super Tuesday.
All the anti-immigrant rabble-rousing appears to be backfiring.
Rubio (second from left) waves along with South Carolina Gov. Nikki Haley (second from right), U.S. Rep. Trey Gowdy (far left) and U.S. Sen. Tim Scott (far right).
South Carolina is a red state. The GOP candidates know that a win here can lead to the party nomination.
Bernie Sanders celebrates his victory in New Hampshire.
Ohio Governor John Kasich takes second place in the GOP race while Senator Marco Rubio drops to fifth.
Can’t touch this.
With the results in, Trump stands proudly on top of what looks like a five-way car crash. What now?
Marco Rubio in Exeter, New Hampshire.
For 100 years, retail politics has ruled the New Hampshire primary. We may be seeing a new dynamic emerge in 2016.