Jan 8 (Reuters) - Sen. John McCain won the New Hampshire Republican primary on Tuesday, the second high-profile contest to chose the party's candidate for the November U.S. presidential election.

Here are McCain's positions on several key issues in the campaign:

IRAQ

McCain has been a staunch supporter of the Iraq war and, particularly, the "surge" in troops there. A Vietnam War veteran and former POW, he has said he would rather lose an election than lose the war.

IMMIGRATION

McCain initially supported a temporary guest-worker program for illegal immigrants but has since shifted his position to emphasize border security first.

TRADE

McCain says opening new trade markets "is a key to U.S. economic success," but also advocates education and retraining for workers displaced by global trade.

CLIMATE CHANGE

McCain has advocated a system that would cap emissions of carbon dioxide, the main gas blamed for global warming, and allow big polluters to trade rights to emit.

TAXES

McCain says taxes should be low, simple and fair.

(Compiled by Jeff Mason in Manchester, New Hampshire; editing by Eric Beech)

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