Premier Dalton McGuinty visits Kitchener-Waterloo on Thursday, where he must call a byelection within six months to replace veteran Progressive Conservative Elizabeth Witmer.

Liberal sources say McGuinty is not ready to call the byelection to replace Witmer, who last week accepted a government appointment to the Workplace Safety and Insurance Board.

NDP Leader Andrea Horwath says she expects McGuinty will call the byelection fairly quickly in hopes of getting the one seat the Liberals need for a majority.

Horwath says the Liberals are so arrogant they believe they'll win the riding Witmer held for 22 years, so she expects the byelection call to come sooner rather than later.

Finance Minister Dwight Duncan says winning the extra seat wouldn't change the Liberals' focus on health care, education and eliminating the deficit.

Deputy PC Leader Christine Elliott says the Tories hopes McGuinty calls the byelection soon so they can get another Conservative in the legislature to replace Witmer.

The riding an hour west of Toronto is getting a lot of attention this week.

Conservative Leader Tim Hudak visited Kitchener-Waterloo Wednesday, while Horwath will be in the twin cities Friday.