Poll: White House race a nail-biter in 4 pivotal states

WASHINGTON - The White House race between US President Barack Obama and Republican challenger Mitt Romney remained a cliffhanger in four critical states that may tip the outcome of Tuesday's election, according to a Reuters/Ipsos poll released on the eve of the election.
Incumbent Obama maintained a four percentage point lead in Ohio, and slimmer leads in Virginia and Colorado, while Romney led by one percentage point in Florida, the poll showed.
In perhaps the most pivotal state of Ohio, Obama had the support of 50 percent of likely voters, while Romney was at 46 percent. On Sunday, Obama led 48 percent to 44 percent.