Former President George H.W. Bush plans to endorse Mitt Romney at an event Thursday in Houston.
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Romney spokeswoman Gail Gitcho says the two will appear together and speak to reporters.
Formal backing from the 41st president is another sign that the Republican Party is uniting behind Romney as pressure builds on challengers Rick Santorum and Newt Gingrich to leave the race.
Read more at Official Wire. By Kasie Hunt, AP.