Question: How many Senate seats will be contested during the midterm elections that Nancy Soderberg has filed to run for Congress in?

<P0-S0> Nancy Elisabet Soderberg (born 1958) is an American foreign policy strategist. <P0-S1>  She served President Bill Clinton as Deputy National Security Advisor and as an Ambassador at the United Nations. <P0-S2>  She is currently President and CEO of Soderberg Global Solutions and Director of the Public Service Leadership Program at the University of North Florida in Jacksonville, FL. <P0-S3>  She was appointed by President Obama to serve as Chair of the Public Interest Declassification Board (2011-2014). <P0-S4>  She has also previously served as President of Connect U.S. Fund, as Vice President of the International Crisis Group, and on the Board of the Jacksonville Port Authority. <P0-S5>  She was a senior advisor to Senator Edward M. Kennedy, and worked on four presidential campaigns. <P0-S6>  She is a member of the Council on Foreign Relations. <P0-S7>  She is a regular commentator on national and international television and radio, having appeared on NBC, ABC, CBS, CNN, BBC, Fox, National Public Radio, the Lehrer News Hour, CNN Crossfire, and The Daily Show. <P0-S8>  She is the author of numerous articles on American foreign policy and two books: “The Prosperity Agends” (2008) written with Brian Katulis, and the Superpower Myth (2005). <P0-S9>  In 1984, Soderberg received a Master of Science Degree from Georgetown University's School of Foreign Service, concentrating on development economics and political risk analysis. <P0-S10>  She received her Bachelor of Arts in 1980 from Vanderbilt University. <P0-S11>  It was reported on July 12th, 2017 that Soderberg had filed paperwork to run for Congress in the 2018 Midterm Elections in Florida's 6th Congressional District, as a Democrat . <SEP> <P1-S0> The 2018 United States elections will mostly be held on Tuesday, November 6, 2018. <P1-S1>  These midterm elections will take place in the middle of Republican President Donald Trump's term. <P1-S2>  All 435 seats in the United States House of Representatives and 33 of the 100 seats in the United States Senate will be contested. <P1-S3>  39 state and territorial governorships and numerous other state and local elections will also be contested. <SEP> <P2-S0> The three classes of United States Senators are made up of 33 or 34 Senate seats each. <P2-S1>  The purpose of the classes is to determine which Senate seats will be up for election in a given year. <P2-S2>  The three groups are staggered so that one of them is up for election every two years, rather than having all 100 seats up for election at once. <P2-S3>  For example, the 33 Senate seats of Class 1 were elected in 2012, the 33 seats of Class 2 were up for election in 2014, and the 34 seats of Class 3 were up for election in 2016. <SEP> <P3-S0> Midterm elections in the United States refer to general elections in the United States that are held two years after the quadrennial (four-year) elections for the President of the United States (i.e. near the midpoint of the four-year presidential term). <P3-S1>  Federal offices that are up for election during the midterms are members of the United States Congress, including all 435 seats in the United States House of Representatives, and the full terms for 33 or 34 of the 100 seats in the United States Senate.