Mitt Romney has won Ohio's Republican presidential primary, narrowly defeating Rick Santorum in the most critical and hard-fought of the Super Tuesday contests.
In all, Romney has gained victories in five Super Tuesday states. The other states he's won are Massachusetts, Vermont, Virginia and Idaho.
Santorum has won Tennessee, Oklahoma and North Dakota, while Newt Gingrich has won his home state of Georgia.
Results from Alaska's caucuses have not yet been reported.
Win or lose there, Romney said "I think we'll pick up a lot of delegates, and this is a process of gathering enough delegates to become the nominee and I think we're on track to have that happen."
In all, more than 400 delegates were at stake on the night, with primaries in Tennessee and Oklahoma as well as Virginia, Vermont, Ohio, Massachusetts and Georgia. Caucuses in North Dakota, Idaho and Alaska rounded out the calendar.
