Poll suggests that Mitt Romney has moved into a narrow lead over US President Barack Obama ahead of a Republican National Convention.
Romney entered the week four points behind Obama in the first installment of a Reuters/Ipsos rolling poll, with Obama leading 46% to 42%.
The former governor of Massachusetts has been in the spotlight at the convention in Tampa, Florida, and is to make his acceptance speech tonight in the biggest test of his White House bid.
Ipsos pollster Julia Clark said the poll results were proof that Romney is getting a positive outcome from the three-day Republican gathering.
So-called convention "bounces" are typically short-lived.
With Obama to accept his party's nomination for a second term next week at the Democratic National Convention in Charlotte, North Carolina, the incumbent could quickly rebound.
Elsewhere, Republican vice-presidential candidate Paul Ryan has said he and Mitt Romney would lead an economic turnaround fuelled by tough choices that will generate jobs and strengthen the middle class.
Mr Ryan accepted his nomination at the Republican convention last night, drawing repeated roars from delegates with promises to challenge President Barack Obama's economic policies.
A fiscal conservative and budget expert, Mr Ryan said the White House race would offer "the clearest possible choice" at the 6 November election about possible economic remedies.
Republican White House nominee Mitt Romney's selection of Mr Ryan, chairman of the House of Representatives Budget Committee, has energised party conservatives, who have doubted Mr Romney at times.
It has also put Mr Ryan's proposed changes to Medicare, the popular health programme for seniors, at the centre of the campaign debate.
Mr Ryan's budget plan would rein in government spending and shift some Medicare participants into private insurance plans purchased with the help of government subsidies, a proposal that Democrats charge would put future benefits for seniors at risk.
Republicans hope to strike a balance at the convention between sharp indictments of President Obama's leadership and a broader introduction of Mr Romney's plans for the economy and the softer side of a candidate who has had trouble connecting with voters.
Mitt Romney will address the Republican National Convention tonight, in what will be his biggest television audience to date.
