House Budget Committee Chairman Paul Ryan (R-Wis.) will join Mitt Romney at two campaign events in Wisconsin on Saturday, one day after announcing his endorsement of the former Massachusetts governor’s GOP presidential bid.

House Budget Committee chairman Paul Ryan (AP photo/Jacquelyn Martin)

Romney, former senator Rick Santorum (R-Pa.) and former House speaker Newt Gingrich (R-Ga.) are campaigning Friday and Saturday in the Badger State, which holds its primary on Tuesday along with Maryland and the District.

The April 3 primaries will mark the last contests until April 24 — when Connecticut, Delaware, New York, Pennsylvania and Rhode Island vote — upping the stakes of the Wisconsin battle.