Super PAC's helping hopefuls like Marco Rubio and Hillary Clinton received big checks recently from obscure corporations or from nonprofits that don't have to disclose their donors' names.
The air traffic control system that choreographs the roughly 7,000 aircraft in U.S. skies at any given moment is the most complex, but also one of the safest, in the world -- and rarely a thought in the minds of the millions of travelers who rely on it.
The caucuses kick off the 2016 presidential nominating contests, marking a new phase in a tumultuous election that has exposed Americans' deep frustration with Washington and given rise to candidates few expected to challenge for their party's nomination when they first entered the race.
Marco Rubio, Jeb Bush, John Kasich and Chris Christie, the four Republican candidates in a showdown for their party's traditional supporters, closed last year with roughly as much money in the bank combined as Ted Cruz, the conservative insurgent they hope to topple.
House Democrats are heading home from their annual issues retreat energized by a pep talk by President Barack Obama but facing steep odds of reclaiming the majority that delivered Obama his greatest first-term victories.
Donald Trump's boycott of the final debate before the Iowa caucuses created space for his rivals to delve more deeply into their differences on immigration, foreign policy, and governing.