DENVER, Colo. – Mitt Romney , until a few weeks ago Sen. John McCain’s rival in a sometimes bitter contest for the Republican Party presidential nomination, says getting back on the campaign trail with the presumptive nominee is fun.

Romney traded blows with McCain for several weeks earlier this year before dropping out of the race and conceding defeat after losing crucial prromney.jpgimary contests on Super Tuesday on Feb. 5.

With past battles behind them, Romney joined the Arizona senator in Salt Lake City, Utah, at a fund-raising event on Thursday, and then flew with him to Denver, Colorado.

“It’s a lot of fun again. It’s nice not to feel any pressure at all, I don’t have to worry about goofing up,” he told reporters on the flight over the Rocky Mountains.

“I can just stand behind the nominee and do my very best to support his campaign.”