While in law school, he was a legislative assistant for the Governor of California and student intern for Judge Rothwell B. Mason.

Christensen was defeated by the incumbent, Jim Matheson, in the 2006 mid-term election and subsequently left the Utah House of Representatives.

However, Christensen filed his candidacy with the Lieutenant Governor's office in March 2008 to run for the same Utah House seat he vacated in 2006.

In May 2008, he defeated the incumbent, Representative Sylvia Andersen, who took over the seat in 2006, at that year's GOP nominating convention and was the party's nominee in the general election for that cycle.

Like Matheson's Republican challengers in the past, Christensen's advertisements focused primarily on party affiliation and national issues.

[citation needed] 2008 Christensen's opponent in 2008 for Utah State House District 48 was Trisha Beck, who narrowly defeated him.

[7] 2012 Christensen defeated Austin Linford in the Republican convention and faced Democratic Party nominee Alain Balmanno in the general election.

[7] 2014 Christensen again defeated Austin Linford in the Republican convention and faced Democratic Party nominee Alain Balmanno in the general election.

In this document, Christensen outlined his argument for Utah's successful Constitutional Amendment banning same-sex marriage.