We said this in May, and in August we'll say it again: There is no obvious sign of a Donald Trump drag on congressional Republicans in their primaries.

The only GOP incumbents who have lost their primaries while sharing a ballot with the outsider presidential nominee have lost in redistricted seats, one of the most common ways for lawmakers to get booted out. And against a challenger who literally tried to get as close as he could to Trump, House Speaker Paul D. Ryan (R-Wis.) won his primary Tuesday night with more than 80 percent of the vote.

But there is evidence that discontent with Washington is still stirring among the Republican base.

In primaries for three open seats across the country, the GOP primary candidates who have fashioned themselves as the outsiders won, beating others in the race probably preferred by the Republican establishment. In fact, in two of those races, the outgoing Republican lawmaker has indicated or outright said he wouldn't support the primary winner. (Sound familiar?)

The most recent example of this played out Tuesday night in the primary for a swing seat in Minnesota's Twin Cities suburbs — a fall race that could be one of the most competitive in the country.

A former talk radio host who has called young, single women "not-thinking," questioned the need to have fought the Civil War and said the "white population" has been "committing political suicide" and "cultural suicide" won the four-way primary in Minnesota's 2nd Congressional District.

Roll Call compared Jason Lewis to a mini-Trump. Outgoing Rep. John Kline (R) hasn't endorsed him. Despite not raising much money, he beat out a business executive with plenty of establishment support and won with 46 percent of the vote.

A week earlier, in a congressional primary for an open seat in Michigan's Upper Peninsula, two of the candidates supported by House Republicans lost to a third, more conservative one.

The same thing happened to Republicans in June in New York's 22nd District, an open, potentially swingy seat that is on Democrats' watch list to try to take back the majority.

There, state Assemblywoman Claudia Tenney beat two other Republicans despite outgoing Rep. Richard L. Hanna (R) saying he wouldn't support her.

"If you want to be a brand in this business and you want to be on Fox News, you can do that," Hanna said at an event in July. "And that's fine — it's not fine, but a lot of people do. But this job is about the people you can help, the district you can serve and how you reflect that."

The list of Republicans who reject their presidential nominee, Donald Trump, and support his Democratic opponent keeps growing. (The Washington Post)

An important caveat: Hanna, who is retiring after three terms, has also become the first (and so far only) House Republican to cross party lines and endorse Hillary Clinton. So he may not be the best representative of the Republican Party as a whole when it comes to Trump and outsider candidates trying to ride his coattails.

And we haven't seen evidence that Trump's coattails are long enough for most primary challengers to hold onto.

But given that some outgoing Republicans are unhappy with the people voters want to replace them suggests Trump might indeed be having some effect on their party's congressional battles.