Libs' Jim Molan risk to Nationals in NSW

Senator Molan has gone rogue after being relegated to an unwinnable spot on the coalition ticket for the May 18 election.

The former major-general is distributing how-to-vote cards celebrating his military record and his role in immigration policy, urging people to cast their ballots for him below the line.

Liberals Hollie Hughes and Andrew Bragg fill the top two spots on the ticket, leaving the Nationals' Ms Davey in the third with a tough battle competing with Senator Molan for the final seat.

"It is an absolute risk for the Nationals in what Jim Molan is doing," Ms Davey told AAP on Thursday.

"It goes against the coalition agreement that we had. It also goes against the intent of the agreement that we had."

Asked whether Senator Molan was letting the coalition down, Ms Davey said: "That would be a conversation for others to have."

She vowed to keep fighting until polling day as she racks up kilometres across regional NSW.

"I hope that if people are drawn to looking below the line, they actually have a good look and they might see my name," she said.

The Nationals decided against running a separate ticket to the Liberals in NSW, despite being at risk of having no senator in the state following John Williams' retirement.

But Ms Davey isn't sure whether waging a distinct Nationals campaign would have helped her chances.

"The Senate is an interesting beast," she said.

"I'm not sure that it would have made much of a difference if we were on our own or joined when you look at all the other columns."

In March's state election, the Nationals suffered wild swings against them in some regions and dropped heartland seats to the Shooters, Fishers and Farmers' Party.

Ms Davey said regional voters were understandably frustrated after tough farming seasons.

"They will probably take some of that out at the ballot box, there is no denying, but the choice in the federal election is far starker," she said.

She said the coalition was committed to delivering the Murray-Darling Basin Plan in full and on time, while Labor wanted to increase water buybacks.

"It's the choice between the carrot and the stick."

Ms Davey said without Senator Williams, NSW senators were mostly people based in on the eastern seaboard.

"While their intentions are good, their understanding of the issues that really bite in the regions is limited," she said.

Australian Associated Press