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Washington (CNN) – While Mitt Romney’s major challengers suspended their campaigns and the primary season essentially ended in April, donations to the super PAC supporting Romney’s candidacy and its spending slowed down as well, according to a monthly financial report filed Sunday with the Federal Election Commission.  

Restore Our Future brought in $4,608,000 in donations in April and spent $2,852,000, compared to March when the PAC received $8,680,000 in donations and spent $12,722,000.   

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The group ended April with $8,210,000 cash on hand, which is more than the $1.5 million it had at the beginning of the month.   

Bob Perry, a Houston, Texas homebuilder and donor to major Republican groups was one of the notable contributors. He gave $750,000 to Restore Our Future in April bringing his total donations to the group to $3.75 million. Harold Hamm, an energy adviser to Romney, gave his first donation of $985,000 to Restore Our Future last month. Hamm is listed by Forbes as the 30th richest person in the United States and is CEO of Continental Resources. Investment manager John Kleinheinz also donated for the first time. He gave $1 million to the PAC.   

One notable person still not on the list was Nevada casino owner and billionaire Sheldon Adelson. Adelson and his family contributed more than $20 million to Winning Our Future, the super PAC backing Newt Gingrich and almost single handedly kept the group alive before Gingrich suspended his campaign. As CNN previously reported, Adelson indicated he would support the eventual Republican nominee. Some financial supporters of Romney met with him in March to urge him to financially back the former Massachusetts governor.   

Last month Adelson told Las Vegas Sun political columnist Jon Ralston he wanted to become less visible in the political world and that references to him being a mogul at the time of his donations were “not helpful to that person.”  

When asked if he was going to give to the Republican super PAC American Crossroads or its non-profit affiliate Crossroads GPS, he initially would not answer. Later, he told Ralston “I’m going to give one more small donation – you might not think it’s that small – to a super PAC and then if I give it will be to a C4,” referring to 501(c)(4) non-profit groups, such as Crossroads GPS, which are not required to disclose their donors.  Adelson refused to say if his “small” donation reference was to Restore Our Future.

“I’m not going to tell you … you’ll find out when it’s reported,” he said.   

(CNN) – Mayor Cory Booker of Newark, New Jersey, a Democrat, said Sunday that some of the current politicking makes him sick – including criticism of Mitt Romney from his own party.

Booker, whose national standing is on the rise, distanced himself from attacks on Romney’s record at the private equity firm Bain Capital, which he said make him “uncomfortable.”

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“I’m not going to sit here and indict private equity. To me we’re getting to a ridiculous point in America,” Booker said on NBC’s “Meet the Press.” “If you look at the totality of Bain Capital’s record, they’ve done a lot to support businesses, to grow businesses, and this, to me, I’m very uncomfortable with.”

Booker compared Romney’s background to his own as mayor and called for the attacks from both parties to cease. The two-term mayor has supported significant budget cuts in his city that he said were necessary to correct its fiscal order.

“This kind of stuff is nauseating to me on both sides. It’s nauseating to the American public. Enough is enough, stop attacking private equity. Stop attacking Jeremiah Wright,” Booker said. “This stuff has got to stop because what it does is, it undermines to me what this country should be focused on.”

Romney’s history in the private sector and a Republican-backed proposal for an ad linking President Barack Obama to his controversial former pastor, Rev. Jeremiah A. Wright Jr., have occupied much of the campaign chatter of late.

Team Obama has condemned Romney and his partners for profiting while some of the companies with which he was involved laid off workers or filed for bankruptcy. Romney’s campaign has defended his record as an example of capitalism and accused the Obama re-election campaign of waging class warfare.

Ultimately, Booker, an Obama supporter, said the 2012 election is about “two men with fundamentally different ideals.”

“The sexy stuff of campaigns that the media plays over and over again that we wasted time talking about is this negative stuff,” Booker said. “The reality is – and I listen to Obama. I have Obama surrogate notes here, they’re talking about the positive issues.”

After an onslaught of attention following his Sunday show appearance, Booker took to YouTube Sunday afternoon to reiterate his support of the president and elaborate on his frustrations with current state of political campaigns.

Booker said Obama “more than deserves re-election,” but that he hopes the general election will focus on the “issues that count.”

“I am indeed upset. I am indeed frustrated,” Booker said. “But I believe the American public, working together can more and more denounce this type of campaigning and more and more focus on the issues that count.”

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