In the 2005 election, Goodhew was a candidate for the National Party, standing in the Aoraki electorate and being ranked 31st on the party list. She won the Aoraki seat and entered Parliament.[2]
In the 2008 election, most of Aoraki was moved to the new Rangitata electorate. It was suggested that this could make the electorate vulnerable to capture by Labour; however, Goodhew won the new electorate with an increased majority.[2]
Goodhew was elected National Party junior whip in 2009, after Internal Affairs minister Richard Worth resigned and was replaced by senior whip Nathan Guy (who was in turn replaced by junior whip Chris Tremain).
Goodhew was returned as MP for Rangitata at the 2011 general election, though with a slightly reduced majority. Goodhew was additionally made a minister outside of Cabinet, holding the Community and Voluntary Sector, Senior Citizens and Women's Affairs portfolios.[3]
In the 2014 election, Goodhew more than doubled her majority over Labour's Steve Gibson.[4] She was reappointed as a minister, retaining the Community and Voluntary Sector portfolio and additionally becoming Minister for Food Safety and an associate minister with responsibility for social development and primary industries.
On 20 December 2016, Goodhew lost her ministerial portfolios in a reshuffle after the resignation of Prime Minister John Key. Although she had originally signalled her intention to recontest the Rangitata electorate, she announced on 25 January 2017 she would retire at the 2017 election.[5][6] She was succeeded as National's candidate and Rangitata MP by Andrew Falloon.[7]