Kaufman shot a 2-under-par 69 on Friday and is at 3-under 139 heading into the final two rounds.
Henderson birdied Nos. 12 and 13 and closed with five pars.
"Obviously I saw (Henderson) playing good, and when she's on, it's hard to beat her but I'm excited to keep fighting", said Ciganda, a two-time LPGA victor.
Ko's two-round total of 136 leaves her six strokes shy of Henderson, who fired a four-under 67 which included three bogeys to maintain her two-stroke lead. "And going into the back nine, I just wanted to give myself as many chances as I could". He made three birdies and an eagle in his round Friday.
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"I felt like today was going to be a really good day", she said. "It's exciting. I'll just need to go out there and play well tomorrow". I was hitting the ball really well and some putts were dropping, which (was) kind of a change from the past few weeks. "It's been a little bit of a rough season so far, not getting the results that I've been looking for but this week seems to be a turnaround week and hopefully I can just finish strong the next two days", Henderson told reporters.
Ko's 85-week reign as world No.1 ended earlier this week when Thai golfer Ariya Jutanugarn won the Manulife Classic in Cambridge, Ontario.
But the new world No.1 has had a slow start in MI, carding back-to-back rounds of two-under 69 to share 30th place with 11 others.
Lexi Thompson shot a 64 on the Blythefield layout reduced to a par of 69 because of flooding, giving her a one-stroke lead.
New Zealand's Lydio Ko finished the tournament in a tie for tenth after a final round one-under 68 while Australia's Sarah Jane Smith finished in a tie for 37th. "It's made me play better the last couple of years".