Absolutely right. The Democrats will be trying to hold  23 seats to 8 GOP and 2 independents (Maine and Vermont) wh usually caucus and vote with the democrats. The 8 GOP seats are all in generally safe GOP territory....though there is a chance that if the Democrats hold every one of their 23 seats....a highly unlikely result...and the 2 independents are re-elected...quite likely.....the GOP could loose Arizona with its burgeoning latino voter bloc....and Nevada.....also the same. And if Trump proves a diseaster....well...who knows...but the remaining six GOP seats...Wyoming, Utah, Nebraska, Texas, Tennessee and Kentucky do not appear to have much chance of switching. If the Dems win 2 more seats and the Independnets are both re-elected, that ties it at 50 50....and the GOP vice president Pence......will cast the deciding vote...f.or the GOP.  But who knows? A year in politics can be a lifetime..