Jo Swinson has said she is "very optimistic" that her party will be "able to cause some upsets" in Thursday's general election. The Liberal Democrats leader added that she's "excited" about the final hours of the campaign "because they can make a crucial difference whether or not Boris Johnson will gain a majority". Report by Thomasl. Like us on Facebook at http://www.facebook.com/itn and follow us on Twitter at http://twitter.com/itn