Most recently, he represented Senate District 9, which encompasses northwest Colorado Springs, the United States Air Force Academy, Monument and Black Forest.

[9][10] All five bills introduced by Lambert were defeated in House committees, including measures to make Colorado a right-to-work state and to prohibit labor unions from deducting fees from government employees' paychecks.

[11] During the legislative session, Lambert filed a formal ethics complaint against the Colorado Education Association, arguing that emails sent by the CEA lobbying in favor of a property tax freeze to bring in additional revenue for public schools included deceptive statements.

[12] The complaint was called "frivolous" by the CEA and was dismissed by the Colorado Legislative Council's executive committee on a vote that was boycotted by Republican leaders.

[18] One piece of legislation he introduced created a specialty license plate commemorating the 100th anniversary of the Boy Scouts of America.

[20][21] In August, Lambert's complaint was dismissed by an administrative law judge, and he was ordered to pay Ritter's legal fees.

[22] The ruling was overturned by the Court of Appeals, and Ritter eventually admitted the charges against him after his announcement not to run for a second term.

[26] Lambert was also a delegate to the 2008 Republican National Convention in St. Paul, Minnesota, alongside El Paso County Commissioner Wayne Williams and Colorado's Attorney General John Suthers.

Lambert produced a bill that focused on establishing an income tax credit for nonpublic education in the state of Colorado.

HB10-1295 would have set forth, as a future tax credit, for families who either pay private school tuition or home-school their children.

During the 2011 legislative session, Lambert sought to remove unnecessary use of state vehicles for personal commuting with SB11-023, a measure he also ran previously as a representative in the Colorado House.

In 2013, Lambert was re-elected by the Senate Republican Caucus to serve on the Joint Budget Committee for the Colorado General Assembly.