By Jeff Mason and Steve Holland HAMILTON, Ohio (Reuters) -President Joe Biden boasted on Friday of a U.S. manufacturing surge and introduced a new small business program in the key swing state of Ohio during his sixth visit there as president Biden was buoyed by strong numbers earlier in the day that showed the U.S. added 428,000 jobs in April https://www.reuters.com/world/us/us-job-growth-solid-april-unemployment-rate-steady-36-2022-05-06, more than expected and the 12th straight month of job gains in excess of 400,000. Manufacturing has seen the largest 15-month job gain in 15 years, he note…