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Texas' junior senator is challenging early caucus state voters to back only presidential candidates with a proven conservative track record.

Sen. Ted Cruz tells conservatives gathered at the Iowa Freedom Summit that the standard should be, "Don't talk, show me."

The Republican was among several would-be presidential candidates appearing Saturday at the forum. Cruz received thunderous applause with calls to repeal fully President Barack Obama's health care law, lock down of the southern border, handcuff environmental regulators and abolish the IRS.

Cruz used his remarks to gather details on activists by having them text message the word 'Constitution' to a number he gave out.

Cruz isn't the only Texan giving thought to a run. So is former Gov. Rick Perry.

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