[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2009/images/11/02/art.bidenthompson.gi.jpg caption="Two political heavyweights are descending on New York's 23rd congressional district Monday,"](CNN) - Two political heavyweights are descending on New York's 23rd congressional district Monday, 24 hours before voters in that closely-watched special House race head to the polls.
Vice President Joe Biden is set to hold a morning rally in Watertown with Democrat Bill Owens at 10 a.m. ET. Biden's visit comes two days after Republican Dede Scozzafava withdrew from the race - a seeming blow to Owens who had benefited from Sozzafava and conservative third-party candidate Dough Hoffman splitting the opposition vote.
Meanwhile former GOP presidential candidate Fred Thompson is also heading to the upstate New York district, holding a campaign event with Hoffman Monday evening.
Thompson, among Hoffman's earliest high-profile backers who was the recent star of a campaign commercial for the independent conservative, said in a statement "Dough is Target No. 1 for the Democrats' political machine, they are desperate to win."
A recent Siena College poll conducted before Socozzafava withdrew from the race suggests Owens and Hoffman were locked in a statistical dead heat, 36-35 percent, with Scozzafava far behind at 20 percent. Political observers predict more than two-thirds of Scozzafava's supporters are now likely to cast their vote for Hoffman.
Biden also campaigned with Owens in September while President Obama made an appearance at a fundraiser for Owens in New York City earlier this month.
Follow Alex Mooney on Twitter @awmooneycnn