Plans are reportedly already under way for a future fundraiser for McCain in Utah that would prominently feature Romney. Romney may also accompany McCain to his next stop today, another fundraiser, this time in Colorado, a state won by Romney.

What is likely the first face-to-face meeting of Romney and McCain since the endorsement boosts Romney's chances of becoming the Republican vice presidential nominee, Jowers said.

"This appearance with McCain certainly enhances his prospects and, perhaps more importantly, provides an opportunity for McCain and Romney to spend some quality time together," Jowers said.

There was no shortage of friction between McCain and Romney during the campaign, but Jowers said he believes Romney is one of a handful of top choices for vice president. McCain, though, is not expected to be in any hurry to make a decision.

The Republican National Convention, which is being held in Minneapolis, isn't until September. Democrats may not even have settled on a presidential candidate when they gather in Denver in August, given how close the race remains between New York Sen. Hillary Clinton and Illinois Sen. Barack Obama.

"McCain has the advantage of the latter convention, which gives him the opportunity to wait and see what ultimately happens with the Democratic ticket before making his final decision," Jowers said.

Romney isn't the only potential running mate for McCain, of course. Utah Gov. Jon Huntsman Jr. has also been mentioned as a possibility. Huntsman, whose father was a national finance chairman for Romney, surprised many Utahns by supporting McCain.

The governor stuck with McCain even when the Arizona senator's campaign was faltering last year because of serious financial difficulties and has campaigned for him in New Hampshire, Florida and other states.

Romney will be accompanied to the fundraiser by his son, Josh, who lives in Utah. Josh Romney had recently considered a run for Congress but ultimately decided not to launch a campaign.

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