Mail-in ballots

Pennsylvania elections official Kenneth Lawrence says Montgomery County is gearing up for a deluge of mail-in ballots, and there won't be a final result on election night.

Campaigns and outside groups are spending tens of millions of dollars on legal challenges leading up to the election, trying to avoid even more damaging — and expensive — fights after polls close.

They're spending tens of millions of dollars in court, fighting down to the wire over absentee and mail-in ballot rules.