In Westminster parliamentary systems, a backbencher is a Member of Parliament (MP) or a legislator who holds no governmental office and is not a frontbench spokesperson in the Opposition, being instead simply a member of the "rank and file". The term dates from 1855. The term derives from the fact that they sit physically behind the frontbench in the House of Commons. A backbencher may be a new parliamentary member yet to receive high office, a senior figure dropped from government, someone who for whatever reason is not chosen to sit either in the ministry or the opposition Shadow Ministry, or someone who prefers to be a background influence, not in the spotlight. By extension, those who are not reliable supporters of all of their party's goals and policies and have resigned themselves or been forced to resign may be relegated to the back benches. For example, Clive Lewis becoming a backbencher after resigning from Jeremy Corbyn's shadow cabinet over Brexit. 
In most parliamentary systems, backbenchers individually do not have much power to influence government policy. However, they play a role in providing services to their constituents, in relaying the opinions and concerns of their constituents. For example, asking the government for funding for a project in their constituency. Some backbenchers also sit on parliamentary committees, where legislation is considered in more detail than there is time for on the floor of the House and, thereby, provide input into the legislative process. The Wright Committee reforms introduction in the UK provided backbenchers with much more power in committees, giving Parliament greater control of its agenda, increasing backbench membership in committees vastly. In addition, since backbenchers generally form the vast majority of MPs, collectively they can sometimes exercise considerable power especially in cases where the policies of the government are unpopular or when a governing party is internally split. Backbenchers carry a considerable amount of influence when the government majority is small, for example, Theresa May's government from 2017 on wards has been defeated sixteen times in the House of Commons, whereas, David Cameron's majority government was defeated three times in the House of Commons.
In some legislative assemblies, sitting at the back of the chamber is not necessarily associated with having a minor role. In Switzerland, senior figures sit in the back rows in order to have a better overview and be closer to the doors for discussions outside the plenary. In Germany, the party leaders sit in the front row, but there are no designated places for other senior figures. Originally, the importance of the front rows for the leaders had also to do with the fact that acoustics were often unsatisfactory before microphones were introduced.
The term "backbencher" has also been adopted outside parliamentary systems, such as the United States Congress. While legislative branches in presidential systems do not share the firm front bench/back bench dichotomy of the Westminster system, the term has been used to denote junior legislators, or legislators who are not part of party leadership within a legislative body. When Democrat Tim Ryan of Ohio ran against Nancy Pelosi of California for House Minority Leader in 2016, the Washington Post reported that he "emerged from the backbench — he literally sits on the last bench in the chamber".
Powers and roles of backbenchers in WestminsterEdit
The most important backbench role many would argue is that of a constituency representative. Constituents rely heavily on their MPs to represent them in parliament and make sure their concerns are heard and welfare is looked after, whether or not they voted for the MP representing them. Constituents can email their MP's and have meetings with them, raising the issues and concerns they want the government to hear. Without this link many people would find it extremely hard for their voices to be heard fairly by the government. Backbenchers have an important opportunity to raise their constituents concerns directly to the Prime Minister in Prime Ministers Questions. Performing well in this constituency role is vital for backbenchers, as if they aren't prominent names in their party, their performance in their constituency could be a big factor on whether or not they will be re-elected to their seat in the next election.
Backbenchers also have an unofficial agenda setting power, with Opposition Day Debates, Private Members Bills, and Prime Minister Questions available to place items on the Parliamentary agenda which are awkward for the government. There is also the Commons Backbench Business Committee which was created in 2010, this has cross party support and debates matters unlikely to be debated in government time, they formally end a decision with a vote. By the end of the 2010 Coalition Government it had undergone 300 debates, ranging from prisoner voting rights to the Hillsborough Disaster. Furthermore, they have influence as discussed above when they are a member of a committee, these committees provide a perfect opportunity for backbenchers to have their voices heard in the legislative process. It usually proves difficult for backbenchers to be involved and have direct input in the legislative process when they are not involved in these activities.
There has been much speculation on the influence backbenchers actually hold in Parliament. Many believe backbenchers hold little to no influence, however, there has been much research to suggest they have a significant background influence. For example, Meg Russel analysed UK government bills and found that successful amendments were due to Parliamentary pressure, 60% of these being substantive. Proving the majority of legislation undergoes unofficial parliamentary pressure. Meg Russel also analysed the impact of the Wright Committee Reforms and whether it strengthened backbench power and influence. She found that the Wright Committee led to a significant reduction in governmental and whips hold over the Commons agenda. Finding that backbenchers have more independence and power because of these reforms, and giving them far more opportunity to set agendas and have their voices heard in Parliament. Furthermore, Louise Thompson found that introducing oral evidence into committees scrutinising government bills had a significant impact on backbench influence. Acting as a vehicle for the formulation of significant changes to government Bills, additional opposition scrutiny, and a debating tool. Oral evidence was most identified in undertakings given by ministers to committee members. Whereas, the number of amendments formally accepted by the government at committee stages is low. It found 89% occasions in which oral evidence had a direct impact on bills. This again suggests that backbenchers exert influence in the background of the Westminster legislation process. Therefore, it can be seen that although backbenchers have little official legislation powers in Parliament, they often exert significant background influence on the legislative process.
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