It might be that these endorsements help bring in some more moderate Republicans to her side but there’s also a very real possibility that she disincentive the more left leaning voters from voting for her as well. Remember, Hillary lost because she didn’t do enough to incentivize people to vote for her. She just relied on people hating Trump and didn’t rely on people actually liking her. Regardless, this is all conjecture. It’s too early to tell and no one will have a definitive answer until the results are in and a winner is announced.