Sen. Lindsey Graham on GOP Primary: 'The Elephant Hasn't Sung Yet, But She's Warming Up

South Carolina Sen. Lindsey Graham said Sunday the GOP primary process is essentially wrapped up for Mitt Romney, though stopped short of endorsing him.

"I think the primary's over, Romney will be the nominee," Graham, a Republican, said on CNN's "State of the Union." "Fiscal and social conservatives will unite and form a bond with libertarians and independents and we'll win the White House if we can run a good fall campaign. Won't be easy, but I like our chances."

He continued, "It'll be Romney. The elephant hasn't sung yet, but she's warming up."

Asked by host Candy Crowley whether that was an endorsement of the former Massachusetts governor, Graham demurred: "I haven't endorsed anybody, but I think -- I'm very comfortable with him."

"Rick keeps exceeding expectations but you know Romney won five delegates in Louisiana," Graham said, referring to former Sen. Rick Santorum's Saturday win in Louisiana's primary.

"He'll get to 1,144 [delegates]," Graham continued. "The last thing I want is a brokered convention."