When are senators are up for re-election?

U. S. Senators are divided among three classes based on what years their terms begin and end. The 33 Senators in Class 1 are currently serving in the 2007-2013 term and come up for reelection in 2012, 2018, etc. The 33 Senators in Class 2 are currently serving in the 2009-2015 term and come up for reelection in 2014, 2020, etc. The 34 Senators in Class 3 are currently serving in the 2011-2017 term and come up for reelection in 2016, 2022, etc.

The states that do NOT have a Class 1 Senator are AL, AK, AR, CO, GA, ID, IL, IA, KS, KY, LA, NH, NC, OK, OR, SC & SD.

The states that do NOT have a Class 2 Senator are AZ, CA, CT, FL, HI, IN, MD, MO, NV, NY, ND, OH, PA, UT, VT, WA & WI.

The states that do NOT have a Class 3 Senator are DE, ME, MA, MI, MN, MS, MT, NE, NJ, NM, RI, TN, TX, VA, WV & WY.