US president Barack Obama and his challenger Mitt Romney are storming into the last day of their long presidential contest, mounting a final thrust before Election Day and engaging in the toughest battleground state – Ohio.

President Barack Obama and Republican rival Mitt Romney attacked one another yesterday in frenzied campaigning as the presidential election enters the closing stages.

Republican presidential nominee Mitt Romney conceded he may be defeated by President Barack Obama in tomorrow’s presidential contest, but insisted it is doubtful.

Republican candidate Mitt Romney was under pressure to produce a strong performance in the early hours of this morning at his first face-to-face debate with President Barack Obama, amid signs Romney may be gaining some ground in the race for the White House.