BASALT, Colo. — After a rocky trip to Europe and Israel in which his remarks drew complaints from British and Palestinian leaders, Mitt Romney flew Thursday to Colorado, an important swing state, to try to regain his footing and refocus his campaign on his core message of renewing the economy.

It was a day to rally the Republican troops around him. At a high school auditorium here, near Aspen, he was backed by 10 Republican governors, including one vanquished rival — Rick Perry of Texas — and several politicians who have been subject of vice-presidential speculation, including Govs. Bobby Jindal of Louisiana, Chris Christie of New Jersey and Nikki R. Haley of South Carolina.

Mr. Perry, who endorsed Newt Gingrich when he dropped out of the nominating fight in January, said to Mr. Romney that “I’m proud to stand with you on this stage,” and told the crowd of a few hundred that Colorado’s energy industry would get a much better shake from Mr. Romney.

“The difference between the current president of the United States and the next president of the United States is that this man trusts you,” Mr. Perry said.