OBAMA PROMISES CHANGE
With the Democratic contest neck-and-neck, Senator Barack Obama said he offered the party its best hope of winning the presidential race.
While he described Hillary Clinton as a formidable opponent, Senator Obama said he was the candidate for change.
MCCAIN 'NO LONGER UNDERDOG'
John McCain declared himself to be the front-runner in the race for the Republican nomination as Super Tuesday drew to a close.
The Arizona senator's campaign had been faltering late in 2007 as he struggled to raise funds to continue his bid.
CLINTON 'HEARS AMERICA'S VOICE'
In a speech to supporters in New York, Democrat hopeful Hillary Clinton said she was ready to get the Republicans out of office.
Speaking at her campaign headquarters, Senator Clinton said she would bring the people's voice back to the White House.
ROMNEY WILL FIGHT ON
Mitt Romney gave a rousing speech to his supporters in Boston despite having what many saw as a disappointing night.
The former governor of Massachusetts said he would not be pulling out of the race for the Republican nomination.
HUCKABEE 'GETTING THERE'
Republican outsider Mike Huckabee addressed his supporters in Little Rock following wins in a number of southern states.
The former Arkansas governor said that he was "getting there" and that his quest to reach the White House would continue.
OPINION IN NEW YORK
As the polls closed in the state of New York, Matthew Price spoke to customers at a bar in Manhattan about how they voted in the Super Tuesday primaries.
Senator Hillary Clinton was projected to win the Democratic nomination for the state which she has represented since 2000.
CANDIDATES CAST VOTES
The candidates on both sides had to take a few moments to cast their own ballots - but that did not get in the way of campaigning.
From Chappaqua in New York - home of the Clintons - to Mike Huckabee's local polling station in North Little Rock, Arkansas, the presidential hopefuls made use of every moment to make themselves heard.
Voting in Super Duper Tuesday has begun, with votes being cast on the east coast of America.
Jon Sopel spoke to voters in New York, which offers the second highest number of delegates for both parties in this contest.
CANDIDATE PROFILES - WHO IS WHO?
All five candidates on their Super Tuesday campaigns
This year, Super Tuesday has become Super Duper Tuesday, with 24 states holding contests to choose who they want to run for president.
If you are still in the dark about what exactly that means, here's a quick guide to everything you need to know.
WHAT IS A CAUCUS?
Some states use a procedure involving public meetings, called caucuses, to choose their presidential candidate.
Justin Webb finds out how the voters of Iowa, the first state to hold their caucuses, go about selecting their nominee.
WHAT IS A PRIMARY?
As the race to become a candidate in the US presidential election continues we look at what is involved.
Justin Webb presents a guide to getting through the hurdle of the primaries in order to become a US presidential candidate.
HOW TO BE PRESIDENT
Fancy leading the free world? Always pictured yourself as the next occupant of the White House?
The BBC's Adam Brookes finds out how you secure the job of your dreams.