Riley and her professional partner Robin Windsor have achieved the highest scores in this year's competition so far for their foxtrot and cha cha cha. They picked up 32 out of a possible 40 points on Saturday's (November 17) performance show at Wembley for a samba set to 'Car Wash' by Rose Royce.
"Michael Vaughan and I have enjoyed a very healthy and hearty bromance - he's fantastic," Daybreak showbiz editor Arnold told The Sun. "But I'd love to see Lisa raise the trophy - she's an incredible person.
"She's had a terrible year with her mum passing away, but the way the nation have taken her to their hearts is a lovely thing to watch."
Arnold left the competition yesterday (Sunday, November 18), after he and Erin Boag fell into the bottom two alongside Westlife singer Nicky Byrne and his professional partner Karen Hauer.
Former Emmerdale actress Riley, who has been confirmed for next spring's Strictly Come Dancing live tour, recently said that she signed up for the show to help question "prejudice" and presumptions about larger women.
"What I wanted to show was that it was okay for someone like me to do a competition like this, to dress in sexy clothes and have fun," she was recently quoted as saying.
Strictly Come Dancing continues next Saturday (November 24) at 6.40pm on BBC One.
Photo gallery - 'Strictly Come Dancing' - week eight: