Current ratio is 51:47:2 not 58:40:2. Democrats have 23 seats up while the Republicans have ten. So it is very reasonable to expect a swing of two or more seats. Included in the Democrats are two independents who are defacto Democrats. Still need to elect a few more anti progressive types as my kids call them. Not as dire as some think. It is almost impossible to get enough total on either side to have a veto proof majority.