Romney to announce running mate Saturday in Va.

(AP) Mitt Romney's campaign says the presumed Republican presidential nominee will announce his running mate Saturday morning in Norfolk, Va.

The short list if there is one is believed to include Ohio Rep. Rob Portman, former Minnesota Gov. Tim Pawlenty and Wisconsin Rep. Paul Ryan.

In a statement issued Friday night, the Romney campaign said the running mate would be revealed at 9 a.m. EDT at the Nauticus Museum. Romney is kicking off a four-day bus tour through swing states.

Romney's choice comes as he tries to repair an image damaged by negative Democratic advertising and shift the trajectory of a campaign that's seen him lose ground to President Barack Obama.

The vice presidential selection will dominate headlines, and Romney's team has been relentlessly teasing the announcement for weeks.