This electon cycle's going to be all about turnout, which is why the Republican party would really rather you didn't bother voting. And in case you were fired up, they're ready and willing to fix you.
PS. Cribbed directly from here:
1-888-DEM-VOTE for the DNC's voter hotline — this will get you directly to DNC lawyers and others to help with fraud issues.
Election Protection's 1-866-OUR-VOTE has live operators who can address some problems over the phone and dispatch lawyers on the ground, if necessary.
Common Cause's 1-866-MYVOTE-1 can help people find their polling place.