Democratic Senator Hillary Clinton and Republican Senator John McCain won their parties' primaries in New Hampshire last night, the second high-profile battleground in the state-by-state contests to choose candidates for the November US presidential election.
Here are their positions on several key issues in the campaign:
IRAQ
Mr 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.
Ms Clinton has taken heat for her initial vote in favor of authorizing the war. Became a sharp critic of President George W. Bush's handling of the conflict and says as president she would start bringing troops home.
IMMIGRATION
Mr McCain initially supported a temporary guest-worker program for illegal immigrants but has since shifted his position to emphasize border security first.
Ms Clinton supports a guest-worker program for immigrants if it does not undermine US workers' wages and favors giving undocumented workers a way to become legal workers. Supported the building of a border wall. Urges development of an employer verification system and higher penalties for employers who exploit illegal immigrants.
CLIMATE CHANGE
Mr 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. He co-authored a bill to cut emissions by 65 per cent by 2050.
Ms Clinton supports an 80 per cent reduction in carbon emissions by 2050, 40-mile-per-gallon fuel efficiency standard by 2017 and 10 per cent cut in energy consumption by 2020.
TAXES
Mr McCain says taxes should be low, simple and fair. Advocates lower tax rates and spending cuts.
Ms Clinton's health-care plan includes some new tax credits and she says she would roll back some of Mr Bush's tax cuts for top income earners. Also proposes new tax breaks for retirement savings.