WASHINGTON -- Mitt Romney's choice for running mate is Wisconsin Rep. Paul Ryan. The presumptive Republican nominee for president announced his VP through his app Saturday morning.

Romney and Ryan are to appear together Saturday in Norfolk, Va., at the start of a four-state bus tour to introduce the GOP ticket to the nation. The pair are being coined as "America's Comeback Team." Romney will travel to North Carolina Sunday.

In the final hours before Romney's team issued the statement, all signs seemed to point to Ryan. The seven-term Wisconsin congressman is a favorite of some conservatives. Ryan heads the House Budget Committee and is author of a House-passed budget that would slash federal spending and overhaul entitlement programs like Social Security and Medicare.

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