Romney secures narrow wins
US Republican presidential candidate Mitt Romney has secured a crucial double win in the Michigan and Arizona primaries.
Television networks called the race for Mr Romney about an hour and a half after polls closed. With 91 per cent of precincts reporting, Mr Romney led rival Rick Santorum by 41 per cent to 38 per cent. Texas congressman Ron Paul trailed with 12 per cent of the vote, and former House of Representatives speaker Newt Gingrich got 7 per cent.
"We didn't win by a lot, but we won by enough and that's all that counts," Mr Romney told cheering supporters.
Mr Romney's twin victories give him fresh momentum heading into "Super Tuesday" next week, when 10 states across the country hold presidential nominating contests.
A defeat in Michigan, where his father was a popular governor, would have raised more questions about Mr Romney's ability to appeal to conservatives and blue-collar voters in the state-by-state battle to take on Democratic president Barack Obama in the November 6th general election.
As they have in other states, those voters chose somebody other than Mr Romney, a former private equity executive who compiled a centrist record as governor of Massachusetts.
But a strong debate performance and an economy-first message helped Mr Romney seize the momentum from Mr Santorum, who has led in nationwide opinion polls since winning state contests in Missouri, Minnesota and Colorado.
Mitt Romney at times played into voter perceptions that he is out of touch with the concerns of ordinary voters in a state that has been hit especially hard by recession and foreclosure.
He told Michigan voters that his wife drove two Cadillacs and mentioned that while he did not follow stock-car racing closely he was friends with several team owners. Democrats have hammered him for his opposition to the 2008-2009 government bailout of the domestic auto industry, which is centred in Detroit.
Mr Santorum, a former US senator from Pennsylvania, emphasised his staunch opposition to abortion and gay marriage as he courted Christian conservatives in the western half of the state.
"A month ago, they didn't know who we are. They do now," he told supporters.
Mr Santorum had appealed to Democrats to back him in the primary, which was open to voters of all parties - a tactic that Mr Romney denounced as "dirty tricks".