US President Barack Obama
US President Barack Obama has won the presidential vote in Florida - widening his electoral victory margin over Republican rival, Mitt Romney.
The vote count in the only state which had not declared a result from Tuesday's election gave Obama 50% to Romney's 49.1%, according to Florida state department figures.
Obama has now won 332 electoral college votes - Romney has 206.
The slow count brought back memories of the bitterly contested recount in 2000.
The Sunshine State's famous "hanging chads" sparked a crisis in that year's Bush-Gore election, eventually leading to a Supreme Court ruling that installed George W Bush in the White House.
Florida's problems began even before election day, with lengthy queues reported during the early-voting period.
Democrats launched a legal challenge against a Republican-backed measure to limit the period during which voters could cast ballots before the election, from 14 days to eight.
They said it was a blatant attempt to suppress Democratic turnout - Florida's African-American voters have tended to cast ballots early in previous elections.
But Governor Rick Scott said the measure, passed by the state's Republican-controlled legislature in 2011, aimed to limit voter fraud.
The early-voting period officially ended last Saturday. Election supervisors in Miami-Dade and other counties did open up voting for several hours on Sunday.
But after being swamped by voters, one polling office in Miami-Dade County temporarily shut its doors. Some in line began to shout: "Let us vote!"
There was also a technical error with an automated phone system that told more than 12,500 voters in another county that the election was on Wednesday.
Florida was not alone in reports of lengthy election day queues. Voters waited for hours in states such as Virginia, New York and Washington DC.
The newly re-elected Obama has said the wealthy must pay more taxes under any political settlement to avert a looming budget crisis.
He has urged Congress to act against the so-called fiscal cliff, a package of tax rises and spending cuts due early next year.
But in a duelling news conference on Friday, Republican House Speaker John Boehner said tax rises would not be acceptable.
Budget analysts warn the US will tip into recession unless a deal is struck.