Donald Trump strategist Paul J. Manafort, left, chats with former presidential candidate Ben Carson as they head to a Trump for president reception at the Republican National Committee Spring Meeting,... (Associated Press) 
 
 Donald Trump strategist Paul J. Manafort, left, chats with former presidential candidate Ben Carson as they head to a Trump for president reception at the Republican National Committee Spring Meeting, Thursday, April 21, 2016, in Hollywood, Fla. (AP Photo/Wilfredo Lee) (Associated Press) 
 
 WASHINGTON (AP) — The Latest on Campaign 2016 two days before voters in Rhode Island, Pennsylvania, Connecticut, Delaware and Maryland cast votes for their presidential nominees (all times Eastern Daylight Time): 
 
 12:05 p.m. 
 
 Billionaire Charles Koch says he doesn't anticipate spending money on supporting or opposing the Republican presidential nominee — and he's leaving open the prospect that Hillary Clinton might be preferable to anyone currently seeking the GOP nod. 
 
 He says the candidate has to be liked as much as Ronald Reagan and "compete on making the country better" rather than tearing down opponents. Donald Trump, Ted Cruz and John Kasich, he said on ABC's "This week," ''are terrible role models." He denies giving money to efforts to oppose Trump. 
 
 Koch also said "it's possible" that Hillary Clinton would be better than a Republican. But he says that he'd "have to believe her actions would be quite different than her rhetoric." The same standard, he said, goes for Republicans. 
 
 ___ 
 
 12:00 p.m. 
 
 Hillary Clinton is reflecting on the life of Harriet Tubman in a Philadelphia church. 
 
 At Triumph Baptist Church in North Philadelphia on Sunday, Clinton praised the abolitionist for the "contributions she made to our freedom," and evoked the image of a "feisty determined woman leading slaves to freedom." 
 
 It was announced this week that that Tubman would be featured on the $20 bill. Clinton said she had visited Tubman's upstate New York home during her time as that state's senator. 
 
 Before the largely African-American congregation, Clinton also promised to work on reforming the criminal justice system and pledged to do "everything I can to take on the gun lobby." 
 
 ___ 
 
 10:30 a.m. 
 
 Donald Trump's chief political adviser says "we're evolving the campaign, not the candidate" — adding policy speeches for a front-runner whose style has been heavy on bombast. 
 
 Paul Manafort tells "Fox News Sunday" that Trump is paying more attention to the political nuts and bolts — from counting delegates and working with party leaders. 
 
 Manafort also contends that his recorded comments at a GOP gathering last week — when he told party leaders Trump was "playing a part" onstage — were taken out of context. 
 
 Trump told supporters on Saturday that "being presidential's easy," and that he's got "to rant and rave" at rallies or people "will fall asleep." 
 
 Trump said he has no intention of reversing his provocative proposals, including building a wall along the Mexican border. ||||| It's a nightmare scenario for Republicans, but conservative billionaire Charles Koch says "it's possible" Hillary Clinton could make a better president than the remaining candidates in the GOP primary. 
 
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 Koch, one of the most influential and controversial forces in Republican politics, said in an exclusive interview with ABC News to air Sunday on "This Week" that he believed Bill Clinton was a better president "in some ways" than George W. Bush. 
 
 "In other ways, I mean [Clinton] wasn't an exemplar. But as far as the growth of government, the increase in spending," Koch said. "It was 2.5 times [more] under Bush than it was under Clinton." 
 
 Democrats have long vilified brothers Charles and David Koch and their multi-million dollar political network, but both maintain they haven't yet spent a dollar for or against any candidates in the 2016 presidential primary. 
 
 In his interview, Koch said that is a result of his disgust with the rhetoric in the Republican primary, and he even suggested Clinton could be a better choice for the country than the remaining crop of GOP candidates. 
 
 "It's possible," Koch said, but didn't say whether he could see himself supporting Clinton in the 2016 cycle. 
 
 "We would have to believe her actions would be quite different than her rhetoric. Let me put it that way," he said. 
 
 Clinton responded to Koch's comments Sunday, saying in a tweet she's "not interested in endorsements from people who deny climate science and try to make it harder for people to vote." 
 
 Not interested in endorsements from people who deny climate science and try to make it harder for people to vote. https://t.co/TWN4zYhMBh — Hillary Clinton (@HillaryClinton) April 24, 2016 
 
 Tune in to ABC's 'This Week' and visit ABCNews.go.com Sunday for more from Chief White House Correspondent Jonathan Karl's exclusive interview.
– Charles Koch is currently sitting on his checkbook, and he tells ABC News that he's not exactly inclined to start scribbling checks—either in support of, or to undermine—the remaining Republican presidential candidates. The billionaire calls Donald Trump, Ted Cruz, and John Kasich "terrible role models," reports the AP, and says a candidate should "compete on making the country better." Then he turns an eye toward Democratic frontrunner Hillary Clinton and imagines the country could do worse, even comparing Bill Clinton's presidency favorably to George W. Bush's. "In other ways, I mean [Clinton] wasn't an exemplar. But as far as the growth of government, the increase in spending," Koch says. "It was 2.5 times [more] under Bush than it was under Clinton." He concedes "it's possible" that Clinton could be a more palatable candidate than her GOP rivals, but that he would "have to believe her actions would be quite different than her rhetoric."