In some precincts in high-dem areas, there are reports that some people (cough: republicans) are going into the booths and staying in them for 45 to 90 minutes "making up their minds".
In other words, they are stalling the lines. A couple of them get in the booths, and a 45-minute wait becomes a 2 or 3 hour wait for everyone else.
Smart, but shady.