Liberal Premier Kathleen Wynne visits businesses in Kitchener and Brampton and helps open a campaign office in Ottawa.
Progressive Conservative leader Tim Hudak plans to visit businesses in Mississauga, Burlington and Brantford today.
There was some controversy Tuesday over the use of images from Russia in a Progressive Conservative election TV ad promoting job creation in Ontario.
Hudak didn't immediately comment, but a party spokesman said he had no idea where the footage came from but defended the commercial as current practice.
Will Stewart, the party's media director, said it was the way advertising works in the 21st century, and accused the Liberals of playing "gotcha" politics by planting the story.
Wynne didn't immediately comment but a party spokesperson called the Tories' claim "baseless and totally false."
Horwath said she had not seen the commercial and refused to discuss it.
Wynne pulled the plug on the legislature last Friday when the New Democrats said they'd join the Tories in rejecting her minority government's budget.