Nonsense! And you know it.
Nonsense yourself. The margin of victory in most Congressional races exceeds 20,000 votes.
Nope. That really depends on the district. A lot of them are under 5000 votes, sometimes a lot less.
20,000 is a very big block to have in your corner.
There sure were a lot of close ones here in Tennessee during this last election, with finger-biting going on in some precincts well past midnight.
But Tennessee isn't one of the states FSP has under consideration. S here's some info for you from one that is:
If you think your single vote can't make a difference, think again! In 1776, one vote resulted in Americans speaking English instead of German. In 1939, one vote passed the Selective Service Act. In Montana, some local elections have been decided by a single vote. In the 2000 presidential election, the margin of victory was so close that one more person voting in each precinct could have changed the outcome!