"A vote for Donald Trump tomorrow is literally a vote for Hillary Clinton in November," he warned later.
Oklahoma is one of 11 states voting on Super Tuesday, which will reward nearly 600 delegates to GOP candidates on a proportional basis. Polls in the Sooner State give Trump a wide lead, with Rubio and Texas Sen. Ted Cruz fighting to place second. That's much the same in many of the other states in play on Tuesday, including Virginia and Georgia.
Jenks embodies perfectly the kind of community packed with the kind of voters the Rubio campaign thinks it can draw. It's a suburb of Tulsa, packed with younger, middle-class Republican families. Several younger parents had young infants with them at the rally. The high school where Rubio held his event sits on a large campus with a football stadium next door. The high school football team has won the state championship 15 times since 1979.
Many people in the crowd waited more than 90 minutes for Rubio to arrive from Oklahoma City. The event in Tulsa included appearances by former Louisiana governor Bobby Jindal and former Oklahoma senator Tom Coburn, who is suffering from cancer and has rarely appeared in public since retiring in 2015.
Rubio is "going to lead us to higher aspirations. He’s going to call on us to do something greater," Coburn told the crowd. "There’s no problem in front of this country that can’t be solved."
Cecilia Manriquez, 57, said she has supported Rubio since he launched his presidential campaign last year. An immigrant from Venezuela, she said the senator "knows what communism can do to a country. And I don’t want our country to go into the hands of people who would do what happened in my former country.”
She called Trump "extremely self-centered and when [candidates] are that way, they don’t listen to others. Trump wants the presidency to satisfy his own pride.”
Deanna McQuay, 36, brought her three children from Skiatook, Okla. to see Rubio for a second time -- they saw him in Oklahoma City last week.
She briefly considered voting for former neurosurgeon Ben Carson, but she said Rubio "seems like a nice person who can articulate the conservative message."
As Rubio concluded the rally, most supporters rushed for the exits. But hundreds of admirers lingered in hopes of shaking his hand or taking a selfie. The David Guetta song, "Yesterday," blasted overhead.
"It seems like trouble's on the way. I'm gonna live, I'm gonna love," the song goes. "Hey, hey, what you say?
I've got no use for yesterday."