A Beechcraft airplane sprays insecticide over Dallas early Monday morning to curb the spread of West Nile virus. LM Otero/AP hide caption

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Gov. Rick Perry rules the roost at the Texas Republican Convention in Fort Worth on June 7. But his endorsement of Lt. Gov. David Dewhurst fell flat this week as Tea Party fave Ted Cruz crushed Dewhurst in a GOP runoff for U.S. Senate. LM Otero/AP hide caption

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Ted Cruz, left, and David Dewhurst shake hands before their Republican Senate debate in Dallas on June 22. LM Otero/AP hide caption

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Texas Gov. Rick Perry is the latest state executive to say no to an expansion of Medicaid. Win McNamee/Getty Images hide caption

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Former Pennsylvania Sen. Rick Santorum speaks at the Bella Donna Chapel in McKinney, Texas, on Wednesday. Rex C. Curry/Associated Press hide caption

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GOP presidential candidates in South Carolina Monday. Stephen Morton/Getty Images hide caption

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