WASHINGTON (AP) -- Mitt Romney's campaign is working hard to chip away at President Barack Obama's advantage among early voters, and there are early signs the effort is paying off in North Carolina and Florida, competitive states that the Republican nominee can ill afford to lose.
Obama is doing better in Iowa, another battleground state.
Obama dominated early voting in key states in 2008, giving him a big advantage over Republican John McCain before Election Day even arrived. Romney's campaign says Obama will not build such a big lead this time.
Early voting for the presidential election has started in more than 30 states. No votes will be counted until Nov. 6. But in early returns, Republican voters outnumber Democratic voters in Florida and North Carolina, while Democrats outnumber Republicans in Iowa.
