And he's continuing to move toward the 1,144 he'll need to be the Republican nominee.
But he took a bit of a break Sunday night.
Mitt Romney appeared unconcerned about tomorrow's primary elections, as he watched his hometown Boston Celtics in the NBA playoffs.
The 107 delegates at stake among North Carolina, Indiana, and West Virginia stll aren't enough to help Romney clinch the nomination. But he is the likely nominee and President Obama is already taking aim at his eventual opponent.
The President tried to portray Romney as out of touch with average Americans, holding his first campaign rallies this weekend in Ohio and Virginia.
"Why else would he want to spend trillions more on tax cuts for the wealthiest Americans?"
Today Governor Romney campaigns in Cleveland.
While the two candidates focus on each other, most political observers in Washington are focused on who Romney will choose as his running mate.
Marco Rubio, one of the names most often mentioned as a vice presidential candidate, is still trying to deflect the question.
"I'm not going to discuss the vice presidential process," he said on Fox News Sunday. "Governor Romney has a process in place. And I'm going to respect that."
Another potential choice, New Hampshire Senator Kelly Ayotte, was more willing to address it on NBC's Meet the Press Sunday. "I would say I have, some would say, better experience than Barack Obama had when he was a Senator and ran."
For the Democrats, the choices are set... or they've made a lot of useless bumper stickers
"There's no way out. I mean, they've already printed Obama/Biden," said Vice President Biden on NBC Sunday,.
Biden was less definitive when asked if he would run for the presidency in 2016.
(Susan McGinnis, CBS News)