Former Wagga Liberal branch president Colin Taggart was one of Mr Molan's supporters trying to urge Riverina voters to mark the boxes 'below the line' rather than follow the Coalition's how-to-vote cards.

Mr Taggart said Senator Molan was popular with the Liberal party "rank and file" but he had been placed at the bottom of the ballot by "factional fighting".

"Jim is a great man, he is a voice of common sense and he was responsible for Operation Sovereign Borders and we really need somebody of his wisdom and experience in the Senate," he said.

"Hopefully, if enough people 'vote 1' for Jim below the line it might keep him in the senate, which would be a great victory."

Senator Molan visited Wagga this month for a bowel cancer awareness event.

Mr Taggart said Riverina Coalition voters who recognised Senator Molan had been receptive to voting below the line, but it was a big ask of people to number 12 boxes instead of one.

"The Liberals we have met know Jim and we have been explaining to them how to vote below the line, so he has a much bigger name recognition than the other candidates," he said.

"Voting below the line is difficult, it's a complex system and people struggle."

Senator Molan's 'below the line campaign' has upset some in the National Party, including former leader Barnaby Joyce, who claimed it put the Coalition agreement at risk.

Riverina MP and Nationals leader Michael McCormack was at Glenfield Park on Saturday afternoon handing out how-to-vote cards.

Mr McCormack said people were free to vote how they liked.

"How they vote in the Senate and the House (of Representatives) is entirely their choice," he said.

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Mr McCormack said he voted below the line himself.

"I voted for Perin Davey number one, and Sam Farraway number two; I want National Party representation in the upper house.

"We have had too much obstruction in the Senate and I do belive the government, and I hope it is a Coalition government, shold have that mandate in the house of review to make sure good policy can become legislation."

Some Riverina voters were struggling to make choices with 'above the line' voting.

Dorothy Prest, from Wagga, drove to the voting booths at the Pilgrim Uniting Church with a group of friends, said a "very uninspiring campaign" had made her decisions harder.

"It was a tough choice who to put last," she said.