The official line in Russia is that it doesn't matter who wins in November, since it won't change what the Kremlin sees as Washington's anti-Russia stance. But some candidates are better than others.
When the remaining GOP candidates debate Saturday, several will be making their last pitch for why they should stay in the race. Meanwhile, Donald Trump returns after skipping an Iowa debate.
New Hampshire has a reputation for strong voter participation and independents. It's really easy to get on the ballot, and it has had a better track record of picking GOP nominees in recent years.
Republican establishment choice Jeb Bush was once the candidate to beat. No more: The success of Ted Cruz, Donald Trump and Marco Rubio in the Iowa caucuses puts new pressure on the party mainstream.
Saying Ted Cruz won through dirty tactics by spreading false rumors that Ben Carson was dropping out, Donald Trump threatened to contest the results after he placed second in the Iowa caucuses.
Hillary Clinton has won the Iowa Democratic caucuses, according to the Iowa Democratic Party. On the Republican side, Ted Cruz upended Donald Trump, while Marco Rubio finished a strong third.
Some wealthy conservative donors, including Las Vegas billionaire Sheldon Adelson, haven't put their money behind any candidate yet while Democratic donors have lined up behind Hillary Clinton.
Trump has inspired strong feelings among religious conservatives. Some see him as a fighter. One prominent leader called him a visionary. Others see him as a "train wreck" who's paying lip service.