Consequently, neither congress nor the president would support the proposal and its heavy cost. what word in the sentence is the coordinating conjunction?

The coordinating conjunction in the above sentence is "nor". A coordinating conjunction is a word that connects phrases, clauses and words. There are only 7 coordinating conjunctions. They are best remembered by using the acronym FANBOYS:
F = for
A = and
N = nor
B = but 
O = or
Y = yet
S = soThe important thing to remember is that a coordinating conjunction gives equal emphasis to both clauses, phrases and words in a sentence. It is also important to remember to add the correct punctuation between the clauses and the coordinating conjuction