"Mitt Romney has earned the Republican presidential nomination through hard work, a strong organization and disciplined message of restoring America after nearly four years of failed job-killing policies from President Obama and his administration."
If there's an important part of the endorsement, the next is it (emphasis added).
"So today I join the many conservative Republicans across the nation in endorsing Mitt Romney for president and pledge to him, my constituents and the Republican Party that I will continue to work hard to help defeat President Obama.
.... Mitt 's vision and record of private sector success will put America back on the path of job creation, economic opportunity and limited government.""
You can read his full statement here.
Oops, that was the Department of Energy's site. You can read the statement here.