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Ted Cruz will name Carly Fiorina as his vice presidential running mate Wednesday, according to two sources — a last-ditch move to regain momentum after being mathematically eliminated from winning the GOP presidential nomination outright.

The Texas senator will make the announcement at an afternoon rally in Indiana, which votes Tuesday in the next GOP contest. Cruz must have a strong showing in the Hoosier State to help block rival Donald Trump from securing the 1,237 delegates necessary to win the nomination, and keep alive his hopes of a contested Republican National Convention.

Fiorina has been a regular — and popular — presence on the Cruz campaign trail in recent weeks since she endorsed the Texas senator in early March. And the Cruz campaign may see her California roots as an asset ahead of that state’s primary on June 7.