OKLAHOMA CITY (AP) - Presidential hopeful Mitt Romney is heading to the Sooner State for an event with Oklahoma Gov. Mary Fallin.

The expected Republican nominee will join Fallin on Wednesday for an event at the Oklahoma Republican Party Headquarters in Oklahoma City. Romney is holding an event earlier in the day at an oil and gas company in Colorado.

Romney's also expected to attend a fundraiser later in the day with Harold Hamm, chairman and CEO of Oklahoma City-based Continental Resources.

Fallin has yet to endorse a GOP candidate for president.

Rick Santorum won Oklahoma's March 6 presidential primary election with 34 percent of the vote. Romney barely edged Newt Gingrich for second place with 28 percent of the vote to Gingrich's 27 percent. Santorum and Gingrich have since both suspended their campaigns.