WASHINGTON - President Barack Obama, picking up support following the Democratic National Convention, widened his narrow lead over Republican US presidential challenger Mitt Romney in a new Reuters/Ipsos poll released on Saturday.

The latest daily tracking poll showed Obama, a Democrat, with a lead of 4 percentage points over Romney. Forty-seven percent of 1,457 likely voters surveyed online over the previous four days said they would vote for Obama if the November 6 elections were held today, compared with 43 percent for Romney.

"The bump is actually happening. I know there was some debate whether it would happen... but it's here," said Ipsos pollster Julia Clark, referring to the "bounce" in support that many presidential candidates enjoy after nominating conventions.

Obama had leapfrogged Romney in the daily tracking poll on Friday with a lead of 46 percent to 44 percent.

The president's lead comes despite a mixed reaction to his convention speech on Thursday night in Charlotte, North Carolina, and Friday's government data showing that jobs growth slowed sharply last month.

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