From the New York Times:
One of the wealthiest and most influential Republican donors in the country is throwing his support to Senator Marco Rubio of Florida, a decision that could swing millions of dollars in contributions behind Mr. Rubio at a critical point in the Republican nominating battle.
The decision by the donor, Paul Singer, a billionaire New York investor, is a signal victory for Mr. Rubio in his battle with his rival Jeb Bush for the affections of major Republican patrons and the party’s business wing.
It comes as a major blow to Mr. Bush, who is seeing his once vigorous campaign imperiled by doubts among supporters, and whose early dominance of the race was driven by his financial muscle. Mr. Bush and several other candidates, including Gov. Chris Christie of New Jersey, had competed fiercely for Mr. Singer’s blessing.