Mitt Romney is launching a bus tour next week with running mate Paul RyanPaul Davis RyanRepublicans are avoiding gun talks as election looms The Hill's 12:30 Report Flake to try to force vote on DACA stopgap plan MORE in the crucial state of Ohio, after remaining mostly off the campaign trail this week to furiously fundraise for his presidential bid.

According to the Romney campaign, Romney and Ryan will participate in a three-day “Romney Plan for a Stronger Middle Class” swing through the Buckeye State; no Republican has ever won the White House without securing Ohio, and it is likely Romney will need to do so this year in his matchup against President Obama.

The two candidates won't actually campaign together. Ryan will attend a Monday event in Lima and a Tuesday event in Cincinnati. Romney, meanwhile, will appear in Dayton on Tuesday before a packed Wednesday that will see the nominee visit Columbus, Cleveland and Toledo.

In addition to his swing through Ohio, Romney is expected to visit Denver, Colo., on Sunday and Monday, according to the city's Fox affiliate, although details of that trip have not yet been released. It will be Romney's first trip to the state in more than a month.

Romney has only held 14 campaign rallies since accepting the Republican nomination 20 days ago — much of his time being devoted to closed-door private fundraisers — so the intensified pace represents a shift in strategy as Election Day nears.

That schedule has drawn some criticism from Republican allies, who believe Romney should focus more on retail politics.

"I think what Romney needs to do is get into Virginia and run for sheriff," Sen. Lindsey GrahamLindsey Olin GrahamCongress punts fight over Dreamers to March Pence tours Rio Grande between US and Mexico GOP looks for Plan B after failure of immigration measures MORE (R-S.C.) told CNN on Wednesday. "This is not rocket science."

That said, Romney has not been significantly outpaced by Obama. Over the past two months, the president has participated in 54 campaign events to Romney's 53 events.