. Why is it so challenging to build winning electoral coalitions for big races such as governor, US senator, or president?

In 48 states and the District of Columbia, the entire slate of electors winning the most to win, but the results submitted by any state are open to challenge at the joint. The President, including selection by Congress, by the governors of the states. The usual anonymity of presidential electors is such that electoral votes

Explanation:

When Americans vote for a President and Vice President, they are actually choosing presidential electors, known collectively as the electoral college.

I hope this helps:D

i believe the answer is:

-   william jennings bryan is a democrat while mckinley was a republican

at that time, the segment of population that choose for democratic party were the voters with low economic background and vice versa

- william jennings has support of populists and wants to have inflation to farmers while mckinley has support of bankers and businessmen , doesn't want inflation

the fixed value of gold make the large business able to stack up their gold without   being worried that it would devaluated.

- william jennings supported the silver standard while mckinley supported the gold standard

according to jenning, using other metal beside gold could the poor people to have more purchasing power and them advance in the society.

what are you options