Presumptive Republican Presidential Nominee Mitt Romney, along with the Republican Party, raised over $40 million last month from donors who support him and want him to be the country’s next president. However, even as he is solidifying himself as the GOP nominee, many of the people who supported his challengers in the primary election campaign have yet to donate to him.

A review of data from campaign finances shows that only a couple hundred donors who donated to candidates such as Rick Santorum or Newt Gingrich have changed their minds and donated to Romney’s campaign or to the general fund for the Republican Party, even though some of the stalwarts of the GOP and Romney’s former rivals have requested that supporters rally behind Romney for a run at the White House.

Nevertheless, Romney is not in need of cash, he had over $61 million still in the bank as of the end of April. However, financial reports that were released over the weekend revealed that there might be a struggle for Romney in trying to persuade the more conservative donors in his party to send cash his way.

Out of a total of 50,000 donors who donated to other candidates in the GOP like Rick Perry, Santorum or Gingrich since the race for the nomination started, less than 600 wrote new checks for Romney during April. Close to the same contributed directly to the Republican National Committee, which is now also helping the ex-Governor of Massachusetts’ campaign.

Romney has aggressively courted conservatives, as he has spoken out about China’s one child policy and giving a graduation address at Liberty University an evangelical school.