By Steve Holland FORT MYERS, Fla. (Reuters) -U.S. President Joe Biden met with Florida Governor Ron DeSantis on Wednesday to tour the devastation from Hurricane Ian, and stressed the need for a united federal and state effort for the lengthy recovery ahead. Biden, a Democrat, and DeSantis, his potential Republican presidential rival, have clashed over issues, including COVID-19 vaccines, climate change, abortion and LGBTQ rights. But during the visit, they largely set differences aside, as Biden pledged federal support for a cleanup and rebuilding effort that could cost taxpayers billions of d…