The Obama Express

Our report began at the home of the "Obama 2012" campaign: the president’s own hometown of Chicago. From there, our train, the Capitol Limited, took us on a journey through the crucial swing states of Ohio and Pennsylvania before dropping us off in the nation’s capital, Washington, DC. Along the way, we encountered supporters, organisers and volunteers as they met with voters questioning whether they made the right decision when they cast ballots for Obama four years ago.

For the campaign, undecided voters are key, and they can be reached in many ways. Campaign volunteer Ken Johnson showed us how it’s done on a sweltering day in an African-American neighbourhood in Cleveland. “It’s about door by door, block by block, neighbourhood by neighbourhood,” Ken told us. Brianna Brown, another volunteer, decided to spend her entire summer in the swing state of Ohio. "If you win Ohio, you can win the election", she explains.

That can be said about many of the battleground states, including Florida, Iowa, Virginia and Pennsylvania, where both the Romney and Obama campaigns have set their sights.

In Pittsburgh, we met the Walton family and their friends before the president took to the stage during one of his campaign stops. All of them voted for Obama in 2008. Their allegiance won’t change, but there are some doubts and niggling disappointments. “I thought it would be wonderful if he could change everything in three and a half years, but realistically I knew that was probably not going to happen," Gary Walton told us.

Obama’s campaign strategists know that waning support, or just a slight lack of enthusiasm, means thousands of lost votes. And so the campaign intensifies: the president regularly leaves the White House, for a day or two at a time, to make his case for another four years.

The campaign volunteers pave the way, but all the volunteers in the world cannot beat enemy number one. We encountered it all along our journey, from the rust belt to the mining heartland to the farmlands. That enemy is unemployment, along with the devastating impact it could have come voting day. Since Franklin D. Roosevelt, no US president has won re-election with unemployment over 7.4 percent. The jobless rate currently stands at 8.3 percent.

It may all be a matter of persuasion, but the Republicans are counting on unemployment in Ohio and elsewhere to be what gets Obama out of the White House.