Ted Cruz

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Sen. Ted Cruz, (R-Texas), speaks during the family leadership summit in Ames, Iowa, Saturday Aug. 10, 2013. (AP Photo/Justin Hayworth)

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** FILE ** Sen. Ted Cruz, Texas Republican, speaks to local residents during a fundraising picnic for the Iowa Republican Party in Des Moines, Iowa, on Friday, July 19, 2013. (Associated Press)

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Sen. Ted Cruz, Texas Republican, on Sunday won an early straw poll for the 2016 Republican presidential nomination. But Mr. Cruz isn't discussing White House aspirations yet. "At this point, 100 percent of my focus is on the U.S. Senate," he said. (Associated Press)

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Sen. Ted Cruz (R-Texas) arrives to speak at a tea party rally against the Internal Revenue Service entitled, "Audit the IRS" on the West Lawn of the U.S. Capitol Building, Washington, D.C., Wednesday, June 19, 2013. (Andrew Harnik/The Washington Times)

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Freshman Sen. Ted Cruz, Texas Republican, will be among the congressional Republicans gathering Wednesday at the Capitol for the "Audit the IRS" rally organized by the Tea Party Patriots, who want to keep reminding everyone of the agency's excruciatingly close attention to conservative groups. (Associated Press)

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Sen. Ted Cruz

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** FILE ** Sen. Ted Cruz, R-Texas, accompanied by Rep. Michele Bachmann, R-Minn., chair of the tea party caucus, speaks during a news conference with tea party leaders about the IRS targeting tea party groups, Thursday, May 16, 2013, on Capitol Hill in Washington. (AP Photo/Molly Riley)

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Sen. Ted Cruz, R-Texas, speaks during the leadership forum at the National Rifle Association's annual meeting Friday, May 3, 2013 in Houston. (AP Photo/Steve Ueckert)