When members of congress vote with their political party, they are acting as

The correct answer to the following question will be "Partisans".

Explanation:

There are a variety of factors that influence Congress member's behavior, including elections, partisanship, and competent government. Some Congress members are seeking re-election from their constituents, which can influence their voting patterns and the problems that they dedicate time whiled in office.One political party's members or partisans are strong supporters.Inside Congress, party tensions may result in legislative deadlock, or contribute to more compromise and negotiation.

Therefore, Partisans is the right answer.