President Obama’s campaign advisers said Monday that he has a clear advantage in Iowa and Nevada as early-voting in battleground states kicks into high gear, while Republican nominee Mitt Romney has an edge in Colorado. The impact of early voting is less certain in Ohio and Florida.
Nearly 14.5 million voters nationwide had cast ballots by mid-afternoon Monday, according to the United States Election Project at George Mason University. The Obama campaign said its push to get voters to the polls early in hotly contested states such as Florida and North Carolina was erasing much if not all of the advantage that Mr. Romney had built up in absentee ballots, which typically favor the Republican candidate.
A super PAC supporting Mr. Romney, meanwhile, went on the airwaves with ads in Pennsylvania on Monday after recent polls showed the race tightening there. The move prompted a pro-Obama super PAC to counter with its own ads in Pennsylvania, and the Obama campaign said that Vice President Joseph R. Biden will visit the state that Democrats have considered safe territory.
Outwardly, at least, Mr. Obama’s top campaign officials expressed confidence that they are winning the race with a week to go, and they pointed to early voting patterns as their proof.
The emphasis on early voting is more prominent than ever this year, with 32 states allowing some form of voting before Election Day. Democrats see it as a weeks-long opportunity to get Mr. Obama’s supporters to the polls, especially people in swing states who vote infrequently.
In Nevada, where early voting began Oct. 20, Democrats held an advantage of 45 percent to 37 percent in party registration of those who voted in the first week. Independents comprised 17 percent of early voters. The biggest turnout has been in heavily Democratic Clark County, which includes Las Vegas.
In Iowa, more than 470,000 people had cast ballots through Saturday, according to the Iowa secretary of state’s office — 30 percent of the state’s total vote count from 2008. Registered Democrats have cast 44.6 percent of those early ballots, compared with 32 percent by Republicans and 23.3 percent by independents.
“In states like Iowa and Nevada, we’re racking up early vote margins so large that, if they continue at this rate, Romney’s going to have to win a huge percentage on Election Day, and he’s just not going to be able to mathematically get there,” Mr. Messina told reporters in a conference call.
Mr. Romney has the early advantage in Colorado, where 38.5 percent of early voters are Republican and 36 percent are Democrat — a 16,000 vote edge for the Republican. About 25.5 percent of early voters there are independents.
In Florida and Ohio, two of the biggest states where both campaigns are focusing intensely, the impact of early voting is not as clear. Voting began Saturday in Florida, and first-day records were set in the Democratic strongholds of Miami-Dade and Broward counties.
As of Sunday, nearly 1.6 million people had voted in Florida. Republicans led through Saturday among absentee ballots cast, 44 percent to 39 percent, although that 5-point advantage was down from a 15-point edge for Republicans at the same point four years ago. Republican officials said all early voting shows their side in the lead, while four years ago the GOP was down by 7 points to the Democrats at the same stage of the race.
A new Tampa Bay Times/Bay News 9 poll shows Mr. Romney holding the edge among voters in a key region of central Florida, winning 51 percent to Mr. Obama’s 45 percent among registered voters the Interstate-4 corridor. That stretch is viewed as vital to winning the state’s swing voters.
Early voting in Ohio began Oct. 2, and by Saturday, more than 1 million people had voted. A Time magazine poll last week showed Mr. Obama with a 2-to-1 lead, 60 percent to 30 percent, among those who already have voted.
But Scott Jennings, director of the Romney campaign in Ohio, said in a memo that “Republicans are crippling Obama’s early vote margin, which was his key to victory in Ohio in 2008.” He said 220,000 fewer Democrats have voted early in Ohio compared with 2008, and 30,000 more Republicans have cast their ballots compared with four years ago.