WASHINGTON D.C. -- Mitt Romney was the big winner on Super Tuesday, but his wins show a continuing weakness with the Republican party's most conservative voters.
Still, he notched a narrow win over Rick Santorum in Ohio, the crown jewel of Super Tuesday, and one of the most important battleground states in the fall election.
Romney was upbeat this morning, focusing on his growing delegate count.
"I must admit that after last night, I feel pretty darn good we had a very strong response all across the country, from Alaska to Vermont," he told supporters.
Romney also won Idaho, Virginia and his home state of Massachusetts.
He expects to nail down the nomination before the August convention, but Rick Santorum's close second in Ohio showed Romney's vulnerability with core conservatives.
Santorum carried Tennessee, Oklahoma, North Dakota.
Newt Gingrich won his home state of Georgia, but he battled with Ron Paul for third in most of the other states.
Romney is still the man to beat, even after a squeaker of a Super Tuesday.