EXCLUSIVE: Tomorrow, Alexander Payne's Downsizing will open the 74th Venice Film Festival. The Matt Damon-starrer marks a number of firsts for Payne, the Oscar-winning filmmaker behind such great pics as Election, Citizen Ruth, About Schmidt, Sideways, The Descendants and Nebraska. Not only has he never had a movie at Venice, he's never even been to the Lido event. As for any pressure of opening the fest, which has become a key launch pad for awards-season contenders…
