Mitt Romney arrives in Colorado on Sunday to begin a critical, five-day run through states that will likely decide the outcome of the presidential race.

Romney will attend an evening rally at a Denver-area high school, hoping to bolster voter support in a state where polls show him losing ground to President Obama.

The GOP presidential candidate continues his swing-state run with a three-day bus tour in Ohio, followed by stop in Virginia.

Obama won all three of those states in 2008, after Republicans won them four years earlier.

Romney is expected to provide more details about his economic plans for America -- amid criticism he has not been specific enough and that his campaign has veered off course.

The Sunday event ends a busy weekend of campaigning for both parties, with the first presidential debate one week away and Election Day about six weeks away.

GOP vice presidential candidate Paul Ryan made two stops Saturday in Florida, telling Cuban-American voters at a stop in Miami that he and Romney will restore the American Dream that brought them to this country