The media mogul Rupert Murdoch signaled his support for Rick Santorum on Monday evening, calling him the “only candidate with genuine big vision” for the United States.

His comments were significant not only because Mr. Murdoch controls Fox News Channel and The Wall Street Journal, but also because they were made on Twitter, a Web site that allowed for his support to be forwarded far and wide on the eve of the Iowa caucuses. Mr. Santorum was a paid analyst for Fox News before he announced his bid for the presidency last year.

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