Washington (CNN) - In another sign the GOP establishment is coalescing behind Mitt Romney, former President George H.W. Bush is scheduled to formally endorse the Republican frontrunner on Thursday.
A Romney campaign spokeswoman confirmed Bush is expected to officially throw his support behind the GOP contender at an event in Houston, near the former president's home.
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Before Wednesday's campaign announcement, the Bush family had already signaled its support for Romney. Earlier this month, the campaign recruited former first lady Barbara Bush to record pro-Romney robo-calls in the days leading up the Ohio primary on Super Tuesday.
"We have known the Romneys for years and believe Mitt is the best man to lead the country for the next four years and Ann will make a great first lady," Mrs. Bush said on the call.
Last December, Bush made it clear he intended to support Romney in an interview with the Houston Chronicle.
"I think Romney is the best choice for us," former President Bush told the Houston Chronicle.
Former Florida Gov. Jeb Bush endorsed Romney last week.