For Republicans, the long road to the 2016 US presidential election began in earnest yesterday in Iowa when a group of potential candidates competed for support among conservatives in the state that will hold the country's first nominating contest.

As many as eight possible candidates are to take part in the Iowa Freedom Summit, a marathon day of back-to-back speeches organized by Iowa's conservative Republican Steve King, a member of the US House of Representatives.

“Do you believe that the next president of the United States is going to be speaking from this stage today?” King asked in an introductory speech. “As do I,” he agreed when the audience clapped.

Early speakers were Republicans who do not harbour 2016 ambitions. They criticised Democratic President Barack Obama, accusing him of bungling the fight against Islamic State and violating the Constitution by unilaterally easing US immigration policy.

“The President is not above the Constitution,” said Iowa Senator Chuck Grassley.

The key names to watch are a pair of governors, Chris Christie of New Jersey and Scott Walker of Wisconsin, who were speaking in the afternoon.

The President is not above the Constitution

Christie is viewed sceptically by many conservatives, and how he crafts his message here could be critical. Many Republicans see Walker as a person to watch in spite of the early attention on the potential candidacies of Mitt Romney, the 2012 nominee, and former Florida governor Jeb Bush.

There are a variety of other people who will be at the event and who could emerge as major 2016 players, such as former Texas governor Rick Perry, who ran for the nomination and lost in 2012, and former Arkansas governor Mike Huckabee, who won Iowa in 2008 but lost the nomination.

Texas Senator Ted Cruz will also speak along with former Hewlett-Packard co-chief executive officer Carly Fiorina, physician Ben Carson and former Pennsylvania senator Rick Santorum.

Steering clear of the event were Bush, Romney, Florida Senator Marco Rubio and Kentucky Senator Rand Paul.

Iowa holds the first nominating contest of 2016 when Republicans and Democrats gather early next year for caucuses.

Today, Cruz will join Rubio and Paul in Palm Springs, California, where about 450 people are attending a winter ‘seminar’ organised by a network of groups founded by brothers Charles and David Koch.

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