(CNN) - Former President George W. Bush and former first lady Laura Bush visited Mitt Romney's Republican presidential campaign headquarters in Boston Tuesday.
The Romney campaign tells CNN the former president addressed Romney staffers. Romney was not at the headquarters during Bush’s remarks. He started his day in southern California and addresses a Veterans of Foreign Wars convention in Reno, Nevada later Tuesday.
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A source with knowledge of the visit said the Bushes "just wanted to drop by, thank the staffers and rally the troops while he happened to be in town."
Bush, who has stayed far away from politics after leaving the White House in January 2009, voiced his support for Romney in mid-May, one month after the former Massachusetts governor became the presumptive GOP presidential nominee.
A spokesman for Bush announced last week that the former president would not attend next month's Republican National Convention in Tampa, Florida.
CNN's Janet DiGiacomo and Kevin Bohn contributed to this report.
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