Republican Maryland governor Larry Hogan has publicly admitted he isn't voting for Republican presidential nominee Donald Trump. Here are the many times Logan has said he won't back Trump's run for the White House. (Claritza Jimenez/The Washington Post)

On Tuesday, Rep. Fred Upton (R-Mich.) appeared to join the #NeverTrump bandwagon, telling a radio host in his district that he wouldn't "endorse anyone in this race, probably the rest of the year.”

On Wednesday, Maryland Gov. Larry Hogan (R) told the Washington Post that he did "not plan to" back Donald Trump, the presumptive Republican nominee for president.

But neither man, however, would disclose who would get their vote. That's become a pattern, as Republicans grit their teeth through media interviews in which the latest Trump quote overwhelms any other news.

Many current Republicans officeholders have said they cannot support Trump, but none, so far, have said they would back Hillary Clinton, the presumptive Democratic Party nominee. Nor have any said they would support Gary Johnson, the former Republican governor of New Mexico who is the Libertarian presidential nominee.

Even the splashiest #NeverTrump moments have ended without support for a clear alternative.

Iowa state Sen. David Johnson, who quit the Republican Party last week over Trump's racist comments about the judge overseeing a case against his Trump University, told the Des Moines Register that he could never back Clinton.

Sen. Mark Kirk (R-Ill.), the first Republican senator to withdraw an endorsement of Trump, made news again this week when he told a local Illinois radio host that Trump was "too racist" to be president. But as he'd done last week, the senator, himself in a tight reelection race, pledged to write in a vote for David Petraeus, the former general and CIA director.

During his presidential campaigns, Barack Obama was successful at winning over some Republicans. In 2008, he won the backing of longtime Iowa congressman Jim Leach, who'd lost a close reelection bid. And in 2012 he was backed by Rhode Island senator-turned-governor Lincoln Chafee, a Republican-turned-independent-turned-Democrat.

Clinton has been endorsed by two Republicans: Both last held office in the 1990s, and had endorsed Obama.

This week, former Minnesota governor Arne Carlson endorsed Clinton with a column in Minneapolis's City Pages: "Hillary was a visitor in our home while I was governor. She'd been working on programs for children, and my wife was very interested in that as well. The two of them went into the fridge and made sandwiches and literally sat up until 1 o'clock in the morning talking.

"I found her very kind, a very good person."

Clinton's other GOP endorsement is from former South Dakota senator Larry Pressler, who lost his seat in 1996 and sought it again in 2014 as an independent. In an interview, he said that "on budgetary and defense matters, she’d probably be the fiscal conservative in the race," but acknowledged that he wasn't making converts.

"I’m 74 years old. I’m going in for a cancer procedure. I’m not that influential a guy," Pressler said. "I’ve gotten a few Republicans and independents who say they feel the same way. I’ve urged them to be more public about it. I’ve gotten some very negative calls from Republican friends, but mostly positive. One of the positive ones came from a friend who hosted a fundraiser for Rob Portman, but he probably doesn't want me to say who he is."

Some of the resistance to Clinton relies on the hope that a miracle may still prevent Trump from becoming the party's official nominee at next month's GOP convention in Cleveland.

Sen. Lamar Alexander (R-Tenn.) has repeatedly told reporters that he will back "the nominee," but chastened them for saying that meant support for Trump.

Two conservative activists in an op-ed this week in the Wall Street Journal called for delegates to the convention be unbound at next month's Republican National Committee rules committee meeting, but no elected Republican has openly backed that idea.

Still, the dream of the party dumping Trump as its nominee remains more attractive than supporting Clinton, even though for years she has been complimented by some Republicans, who argue that she would have been a better president than Obama — a closeness with the GOP that has some progressives still balking at her being the Democratic nominee.

Still, even some of the Republicans getting attention for bucking Trump are careful to insert escape clauses, explaining how the candidate could tack in his rhetoric and win them back.

“We’ve got a long ways to go, but it seems to a lot of us that the train is off the track,” Upton told WHTC-AM. “We’ll see if he’s able to put it back on the track, I don’t know, but not a lot of happy campers in terms of how this race is proceeding so far.”