We have some extremely close House races in Arizona. They may not be decided for days as provisional ballots are counted. Ron Barber is slightly behind in CD2 while Kirsten Sinema and Ann Kirpatrick are slightly ahead in CD9 and CD1 respectively. In both of the latter cases, the Libertarian candidate is taking about 6% of the vote and most of that is almost certainly at the Rethugs' expense. Unfortunately, there was no Libertarian candidate in Ron Barber's race else I'm quite certain he'd have already won.
I know we don't generally care for Libertarians and their impractical ideas but they certainly appear to have helped Dems here in Arizona!