State Treasurer Jeff DeWit, who is close to Trump, reportedly was unlikely to run against Flake, but he says that his retirement is a "game changer." An unnamed state GOP operative told CNN on Tuesday that DeWit would have Trump's support if he enters the race quickly, but he had "two days to grab the ring." The Washington Examiner, also citing unnamed party insiders, suggested that DeWit "could be discouraged from running by the opposition research book," though there aren't any details about what's in said opposition research book.

Trump and his allies, including DeWit, seemed to have been ready to back Graham two months ago, but there were no obvious developments in the ensuing time. Graham, the former state party chair, said after Flake retired that he's still considering, and that he and DeWit agreed that only one of them would run.

Wealthy attorney Jay Heiler, an ally of ex-Gov. Jan Brewer, said earlier this month that he was also considering challenging Flake, and he also quickly reaffirmed his interest and insisted that Flake's decision wouldn't impact his own. Notorious ex-Maricopa County Sheriff Joe Arpaio, who was pardoned by Trump in August, also had flirted with facing Flake, and said on Tuesday that he wasn't saying no. However, Arpaio is famous for talking about running statewide but never doing it, though unlike in past years, he has no elected office to fall back to.

GOP insiders also mentioned a number of other state Republicans who have yet to signal interest in this seat. Among the names dropped are: freshman Rep. Andy Biggs; wealthy former GoDaddy executive Christine Jones, who narrowly lost the primary to Biggs last year; Maricopa County Attorney Bill Montgomery; state Sen. Steve Montenegro, who is currently running for secretary of state against a GOP incumbent; Arizona Christian University President Len Munsil, who badly lost the 2006 gubernatorial election to Democratic incumbent Janet Napolitano; Attorney General Mark Brnovich; and ex-Rep. John Shadegg, who retired in 2010. (Note: this post has been corrected to properly note John Shadegg’s identity and background.)

The one member of the GOP House delegation who has said no so far is Rep. Paul Gosar, whose office said he would seek re-election on Wednesday. Gov. Doug Ducey, who is seeking re-election next year, also quickly slammed the door on a Senate bid.

On the Democratic side, there has been little change so far. Rep. Kyrsten Sinema, who jumped in with the DSCC's support, still has no credible primary foes on the horizon. While California Rep. Ro Khanna suggested that Rep. Ruben Gallego could run, he apparently didn't bother asking his colleague since Gallego quickly said no. Rep. Raúl Grijalva did not show any interest in running himself either, but he relayed that, with Flake gone, there's "buzz among progressives and labor" about finding a more liberal candidate than Sinema. Grijalva didn't drop any names, and said that, "On some issues coming up — with DACA, with tax reform, with the budget — people are waiting to see how she positions herself."