In the final days before the election, the Arizona Republican Party sent mailers to some Democrats tying the Angela Green, the Arizona Green Party candidate for U.S. Senate, to Sen. Bernie Sanders, I-Vt.

The mailers appear to be a tactic to peel off left-leaning voters from U.S. Rep. Kyrsten Sinema, the Democratic candidate for Senate who some have said isn't liberal enough.

Sinema, who represents the 9th Congressional District, faces Republican U.S. Rep. Martha McSally, who represents the 2nd Congressional District, in a race seen as too close to call.

Green said Thursday that she was dropping out of the Senate race and endorsed Sinema.

One mailer shows Green and Sanders and calls both "ultraliberals" who have a "radical agenda." The mailer says both are "too extreme for Arizona." It then details Green's "radical, Sanders-style agenda," noting her support for Medicare For All, legalized marijuana, higher taxes, amnesty and clean energy mandates.

A disclosure on the mailer says it was paid for by the Arizona Republican Party.

This isn't the first mailer AZGOP sent about Green. A previous piece sent to Democrats makes similar claims, saying Green is "too far to the left" and mentioning marijuana legalization, coverage of pre-existing conditions and opposition to tax cuts.

The Arizona Republican Party did not immediately respond to a request for comment on the mailers.

But a party spokeswoman previously told HuffPost that both Green and Sinema have extreme views.

"The only difference between them is that Kyrsten Sinema is in the witness protection program for liberals, trying to hide her extreme agenda from Arizonans," Ayshia Connors, a state GOP spokeswoman, told HuffPost.

In a tweet about the mailers on Nov. 4, Green said she prefers to be called a "progressive ... with a heart."

"One of the reasons I ran as a 3rd party candidate is because I know we can make a difference if someone just uses their voice," she wrote on Twitter.

Rodd McLeod, a spokesman for Red and Gold, a liberal group that's attacking McSally, said the group is warning voters to beware of the mailers.

"Arizona Republicans are trying to trick voters into supporting a candidate who has already dropped out of the race," McLeod said.

Reach reporter Rachel Leingang by email or by phone at 602-444-8157, or find her on Twitter.