If you weight all of the LV polls by sample size, it comes to around 6 points in favor of the dems. They only gained 30 seats with an 8 point advantage in 2006. It still looks to be a very close margin if they do win control.
All these polls are just that polls, that have been proven to be inaccurate the last several election cycles.
God help us if the DEMS win the majority in either House. I feel we haven't done enough once again. Many, many people relied on the words and promises of Pres. Trump, forgetting that 535 members of Congress ARE responsible for the situation that we are in; they are the ones that make laws, make the budget, confirm judges, make treaties, serve on committees, etc. Pres. Trump is not up for re-election, our Congressmen are; though he's gone around the country begging people to vote GOP in key Congressional races.