I think we have two different holidays for them because they honor 2 different events in history .
False. the Republicans picked up net gains of 3 house seats and 4 Senate seats.
According to CNN, "the line of succession falls to the speaker of the House, then to the Senate president pro tempore, then to Cabinet members."
Source: http://www.cnn.com/2013/08/27/us/succession-presidential-and-vice-presidential-fast-facts/