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Presidential Rivals Obama and Romney Prepare for First Debate

Obama was huddling with top advisers at a desert resort in Nevada, while Romney was practicing in Massachusetts before heading to Colorado, the site of the first debate before the U.S. elections in November.

Republican Mitt Romney was hoping to change the trajectory of his campaign Monday as he and President Barack Obama studied for their first debate on Wednesday, one of Romney's best, and last, opportunities to stop Obama's rise in the polls.

Adding to the performance pressure was the growing momentum in early voting, with the most important of the battleground states that will decide the November 6 election, Ohio, starting to take ballots Tuesday.

Obama was huddling with top advisers at a desert resort in Nevada. Romney was practicing in Massachusetts before heading to Colorado, the site of the debate and another of the handful of states that will determine the election.

Polls show Romney trailing Obama in many of those nine battleground states, which do not reliably vote Democrat or Republican and have been deluged by campaign ads and visits. All but two of them have early voting.

The first of the three presidential debates is focused on domestic issues like the economy, which remains voters' top concern. Romney has a chance to  convince the public that he's the better candidate to turn the country's high  unemployment around.

"What I'm most concerned about is having a serious discussion about what we  need to do to keep the country growing and restore security to hardworking Americans," Obama said during a rally in Las Vegas Sunday night. "That is what people are going to be listening for. That's the debate you deserve."

Republicans were keeping up the pressure on Obama on international issues, namely his administration's handling of the attack on a U.S. consulate in Libya that led to the death of the U.S. ambassador and three others.

The Obama administration has called it a terrorist attack. It came amid violent protests in the Muslim world over an amateur anti-Islam film made in the U.S.

Romney, in an opinion piece in The Wall Street Journal, repeated his criticism of Obama for having called the attack and other unrest in the Middle East "bumps in the road."

"Our country seems to be at the mercy of events rather than shaping them," Romney wrote. "We're not moving them in a direction that protects our people or our allies."

Romney's running mate, Paul Ryan, on Sunday shot down the idea that Romney needed to have a breakthrough performance in Wednesday's debate, saying he didn't think one event would make or break the campaign.

Romney's team has made no secret of the fact that the former Massachusetts governor has been practicing intensely for several weeks.

Obama aides have kept quiet about how and when the president is practicing.