The reason why the two major parties poach or adopt any idea promoted by a third party that proves to be popular with voters is that it gives them more chance of getting people's votes as well as forming electoral coalitions.
A two party system can be defined as a party system in which two political parties are involve during an election.
This two political parties are the major parties that often win an election based on the fact that people tend to vote for this two parties as a result of this majority of votes in an elections goes to them.
Hence, the reason why the two major parties poach or adopt any idea promoted by a third party that proves to be popular with voters is that it gives them more chance of getting people's votes as well as forming electoral coalitions.
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