Vic Lib leader Guy joins the SA campaign

He went largely unnoticed, but Victorian Opposition Leader Matthew Guy has dipped a toe into the South Australian election campaign by handing out how-to-vote cards for the Liberals on polling day.

Dressed in a T-shirt supporting SA Liberal leader Steven Marshall in his marginal seat of Dunstan, Mr Guy looked like any other volunteer outside the Norwood Primary School on Saturday.

Mr Marshall's seat is considered marginal, however it would be a huge upset if it fell to either Labor's Matt Loader or SA-BEST candidate Jack Noonan.

The pair caught up briefly, Mr Marshall shaking hands with Mr Guy, who wished his SA counterpart all the best.

Mr Marshall thanked Mr Guy, and said he would return the favour at the next Victorian election.

"I have a funny feeling I'm going to be doing exactly the same for you come November," he said.