Authors: Joshua Cohan

ABC News(WASHINGTON) -- Former Pennsylvania Senator Rick Santorum is suspending his campaign for the presidency, ABC News has learned. Santorum is expected to make the announcement on Tuesday.
The news comes the day after Santorum's 3 year-old daughter Bella was released from the hospital -- her second trip this year. She suffers from a rare and often fatal disorder called Trisomy 18.
Santorum’s decision to step aside leaves only former Massachusetts Governor Mitt Romney, former House Speaker Newt Gingrich, and Texas Rep. Ron Paul in the running for the Republican nomination.
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