He competed with Marilinda Garcia and Jim Lawrence in the Republican primary for the chance to challenge incumbent Democrat Ann McLane Kuster in the general election.

The Nashua Telegraph's Politifact Truth-o-Meter rated Lambert's claim in its opinion as a "Pants on Fire" lie, as Garcia has indicated that she does not support increasing the overall tax burden.

[4] Politifact New Hampshire's Truth-o-Meter has also rated a past campaign statement of Garcia's in its opinion as "mostly false".

[5] A television ad released by Lambert's campaign was criticized by former New Hampshire Speaker of the House of Representatives William L. O'Brien.

[6] O'Brien, who had just recently lost his position as Speaker of the 400 member New Hampshire House of Representatives, had earlier himself planned to run in the 2014 election for the same congressional seat.