In October 2013, he became the Liberal Democrat Minister at the Department for Environment, Food and Rural Affairs, holding the office until losing his Parliamentary seat to Conservative candidate Scott Mann.

Rogerson first stood for Parliament in 2001, contesting the North East Bedfordshire seat, increasing the Liberal Democrats' share of the vote by 2.1%.

In 2006 Rogerson asked the government to make 5 March a public holiday in Cornwall to recognise celebrations for St Piran's Day.

[7] He was Liberal Democrat Shadow Minister for Communities and Local Government[8] until the 2010 election and was the youngest male MP in the House of Commons during the 2005–2010 Parliament.

[16] In the 2015 general election, Rogerson stood for re-election as MP for North Cornwall, but was defeated by Conservative candidate Scott Mann by 6,621 votes - a swing of over 9,000.

In July 2018, Rogerson announced that he would not contest the North Cornwall seat again for the following general election, stating that someone new was needed to defeat MP Scott Mann.