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The Romney campaign, however, would only comment on the support their candidate is getting, rather than potential support in the future.

“We appreciate everyone who is working to help get Mitt Romney elected in November so that we can turn our economy around and get our nation back on the right track,” said a Romney campaign official.

Still, former rivals and critics of Mr. Romney are consistently reminded of their past criticisms that President Obama’s campaign are now making — his refusal to release more years of his tax returns and his tenure at Bain Capital, for example. Their answer? Take a look at the other guy.

“It’s very easy to support Mitt Romney when [the] opponent is Barack Obama,” Mr. Gingrich said Monday.

Other former Republican presidential rivals, meanwhile, remain somewhat on the fringe. Former Utah Gov. Jon Huntsman Jr. has endorsed Mr. Romney, but has said he will not attend the Republican National Convention. After suggesting in March the idea of a third-party candidate merited attention, he was summarily uninvited from a Florida Republican event.

Rep. Ron Paul of Texas, who has ramped down his campaign but technically remains in the race, will have hundreds of delegates at the Republican National Convention in Tampa, Fla.

Mr. McDonnell, who chairs the Republican Platform Committee, said that one of the two Virginia members of the committee is a Paul supporter. Mr. Paul has planned a rally before the convention starts.

Jesse Penton, a senior official with the Paul campaign, said supporters want to have their views included, and that the campaign has had productive talks with “multiple parties” involved in the platform committee.

But while support from surrogates like vice-presidential contenders Mr. Portman and Mr. Pawlenty is not terribly suprising, more unlikely backers have emerged as well. Former Alabama Rep. Arthur Davis, who seconded President Obama’s nomination at the Democratic National Convention in 2008, is now a Republican, and recently spoke at an event organized in part by the Romney campaign at a home in Bristow, Va.

Virginia Attorney General Kenneth T. Cuccinelli II, who is eyeing a bid for Virginia governor in 2013, previously said that if Republicans chose Mr. Romney as their candidate, they would “basically be conceding” the issue of health care to Democrats because Mr. Romney helped enact a plan similar to the one championed by Mr. Obama when he was governor of Massachusetts.

But Mr. Cuccinelli introduced Mr. McDonnell and Mr. Romney at a recent campaign event in Sterling, Va., and, akin to Mr. Gingrich, has said voters have two choices on health care: Mr. Obama, who supports the law, and Mr. Romney, who has vowed to repeal it.